Prevalence and predictors of vitamin a deficiency among infants in Western Kenya using a cross-sectional analysis.
In Africa, 2.5 million preschool age children are estimated to suffer from night blindness and 56.4 million have subclinical vitamin A deficiency (VAD), which is indicated as serum retinol concentration less than 0.70 [micro]mol/L, reflecting a severe public health problem . Associated disorders of VAD remain common in Africa despite knowledge of its consequences and interventions undertaken . Infants have increased vitamin A (VA) requirements to support rapid growth and combat infections. Severe VAD at this age can cause visual impairments, anaemia and weakened immunity, with an increased risk of morbidity and mortality from measles or diarrhoea . Losses of 121,000 Disability Adjusted Life Years (DALYs) annually in Kenya is attributable to VAD, which amounts to loss of between 0.5 and 1 percent of gross national product . The Western province of Kenya has the lowest national VA supplementation (VAS) coverage (19.8%), contrasting with national averages of 30.3% and 73% in sub-Saharan Africa and also ranks second in under five mortality (121/1,000 live births) [3,4].
Occurrence of VAD tends to cluster rather than be evenly distributed. Epidemiologic traits or risks that characterize situations where it occurs include economic, social, ecological, and hostrelated factors . A good understanding of these situations is important for appropriate and effective interventions. Western Kenya lacks data on VAD prevalence among children 6-23 months but it is likely important because the neighbouring province, Nyanza, has VAD of about 23% among children aged 6-59 months . In the measurement of VA status, subjects with infections need to be identified because Retinol Binding Protein (RBP) levels are lowered by infection . Participants in the study with raised Creatine-reactive protein (CRP) should be excluded from evaluation or values adjusted, otherwise the results for VA markers could give a false-high rate of VAD .
Onset of growth faltering such as stunting in infants is commensurate with inappropriate complementary feeding, that may be compounded by maternal undernutrition and intrauterine growth retardation, where the first 24 months represent a window of opportunity for intervention . In some African countries such as Mauritania, Ghana and Ethiopia there is some reduction in stunting, although further reduction is unlikely to occur in the future if recent trends continue . Important to this study is the target population of children aged 6-23 months, who are within the critical window where linear growth responds most to environmentally modifiable factors related to feeding, infections and psychosocial care [9, 11]. In western Kenya, 34.2% of children under five are stunted compared to the national figure of 35.3% meaning an alarming situation as per the WHO classification [3, 12]. Addressing stunting through integrated packages of nutrition-specific and nutrition-sensitive actions that focus on the first 1,000 days is one of WHO's global targets, endorsed by the 65th World Health Assembly, as part of the post-2015 sustainable development agenda . Vitamin A deficiency begins by the body depleting its stores of VA as a result of various causes, which progresses to sub-clinical and then clinical signs which in some cases lead to death. It is, therefore, important to identify the correct VAD status and identify potentially important predictors/risk factors so that the progression of VAD is controlled or halted. The objective of this study was, therefore, to determine the prevalence of vitamin A deficiency, malnutrition (wasting, stunting, and underweight) sub-clinical infection and identify risk/predictor factors associated with VAD among children 6-23 months in selected study sites of Western Kenya.
Study design and sampling
This was a community-based, cross-sectional survey within catchment areas served by health facilities offering ante-natal care services in Busia and Bungoma Counties. The sampling frame constituted all villages of the catchment area of the health facilities with the number of households/village, as per the Census of 2009 (average of 113 households/village). Cluster sampling design was used where clusters were selected using "probability proportionate-to-size" based on the list of villages covered by the health facilities . A total of 104 sample points were identified. A household was defined as a person or a group of persons, related or unrelated, who live together and who share a common source of food .
This study was done in Busia and Bungoma counties, specifically in the sub-counties of Bunyala, Kimilili, Bungoma North and Bungoma East. Economic activity in Busia is mainly trade with neighbouring Uganda, particularly in Busia town. Away from town, the county's economy is reliant on fishing and agriculture, with cassava, millet, sweet potatoes, beans, and maize being the principal food crops . Sugarcane-growing is important in Bungoma, with one of the country's largest sugar factories and numerous smallholder sugar mills. Subsistence crops include maize, pearl millet and sorghum. Dairy and poultry farming is widely practiced. Due to high rainfall experienced in the area throughout the year, Bungoma has several large rivers, which are used for small-scale irrigation .
All sampled children aged 6-23 months and their caretakers.
Demographic and socio-economic information
Demographic and socio-economic information about caretakers, household and index child was collected using a questionnaire.
Consumption of VA-rich foods during past 7 days
The Helen Keller International (HKI) food frequency method was used to assess the community risk of VAD . The HKI food table was adjusted to fit the local requirement/conditions and total number of foods included was recorded. A community is considered to have a VAD problem if: the mean frequency of consumption of animal sources of VA is 4 days/week or less; or the mean frequency of total consumption of animal and plant sources of VA (weighted by the food sources) is 6 days/week or less.
Child nutritional status
Anthropometric measurements for the children were performed to determine weight-for-length, length-for-age and weight-for-age z-scores. Weights were obtained using a SECA[R] electronic UNISCALE. Length measurements were carried out using a Schorr[R] measuring board. All children were measured recumbent on the board. Definitions of nutritional status were: stunted: height for age z-score <-2 SD, wasted: weight for height z-score <-2 SD of the WHO Child Growth Standards median and underweight a composite indicator for both stunting and wasting.
Blood sample collection using dried blood spots
Capillary blood for dried blood spot (DBS) collection was obtained from randomly selected target children by trained laboratory technicians using single-use sterile micro-lancets. The child's hand was first warmed followed by finger cleaning using 70% alcohol and piercing with the lancet. The first drop of blood was wiped with sterile gauze and subsequent drops were spotted five times on a filter paper labeled with the participant's identification number. The filter papers were dried two to three hours in closed airtight plastic boxes and covered with black paper to prevent any potential photo-oxidation of the sample. Dried filter papers were placed in zipper-locked polythene bags along with silica gel and sent to the laboratory to be stored in deep freezers at KEMRI (< -20[degrees]C) until analysis.
Selection of samples
Dried blood spots were obtained from 1,482 respondents. The samples were analyzed in singletons, with approximately 10% analyzed in duplicates. All analyses were carried out at KEMRI/CDC Malaria Laboratory in Kisian, Kenya. The DBS samples were selected using systematic sampling and analyzed for RBP as indicator of VA status, and CRP as indicator of sub-clinical inflammation. Validation of DBS as a matrix using 60 matching serum-DBS samples was carried out and the relationship between serum and DBS, RBP and CRP was used to obtain factors to correct DBS, RBP and CRP values to serum RBP and CRP values, respectively.
Analysis of samples for retinol binding protein
Analysis of RBP, an indicator of VA status, was carried out using rapid enzyme immunoassay technique . This was quantified with the use of the SCANLISA RBP Assay (Scimedx Corporation). The inter-assay and intra-assay CV of the assay were <10%. Definition of VA status was serum RBP concentration <0.825 [micro]mol/L (biologically equivalent to <0.70 [micro]mol/L retinol) .
Analysis of samples for Creatine reactive protein
Creatine reactive protein is the most commonly used sensitive acute phase protein for monitoring infection and inflammation, particularly in assessing bacterial and connective tissue diseases . Enzyme-linked immune-sorbent assay (ELISA) kit (Immuno-Biological Laboratories, Inc., Cat. No.: IB59126) with a high sensitivity CRP was used to quantify CRP. The intra- and interassay CV were <10%. The threshold for defining inflammation was CRP>5mg/L.
Authority to conduct this study was obtained from Maseno University and permission from local administrative officers in the four sub-counties was granted. Blood data were analyzed for groups and no individual response was identifiable. Verbal consent and assent for children was obtained from respondents prior to participation. The study was granted approval for implementation by both national as well as Program for Appropriate Technology in Health (PATH)'s Ethical Review Board (ERB).
Data were analyzed using the Statistical Package for Social Sciences statistical software package version 19.0 for Windows (SPSS Inc., Chicago IL, USA). Normal distribution of quantitative data was tested using normal distribution curve. Two-sample proportion z-test was used for child characteristics (age & gender), point prevalence of VAD between sub-counties, and nutritional status of children (stunted & wasted). Pearson's [chi square] test was used to compare knowledge scores of caretakers by individual and household characteristic and determine predictors for VAD in the multivariate analysis. First, a bivariate analysis was carried out to identify potential predictors for the main study outcome. The criteria for selection of potential predictors was to eliminate variables whose risk estimate based on odds crude ratio were insignificant (p>0.05). A multivariate logistic regression analysis was then used to test the association between potential predictors. The level of significance was set at p-value < 0.05.
Demographic and socioeconomic characteristics of caretakers and children 6-23 months Characteristics of child caretakers in the study
Mean age (years) of caretakers was 30 in Bungoma North, Bungoma East and Bunyala while in Kimilili it was 28. Average household size across the four sub-counties was 6 persons. Caretakers in formal schooling during the survey were highest in Kimilili (4%) and lowest in Bunyala (2%). Uneducated caretakers were highest in Bunyala (8%) and lowest in Kimilili (1%). More caretakers in Kimilili (27%) had education higher than primary-school level compared to those in Bunyala (15%), which had the lowest. Average years of formal education were highest for caretakers in Kimilili (8.2 years) and lowest in Bunyala (6.8 years). Majority of the caretakers were in monogamous marriages ranging from 67% in Bunyala to 81% in Bungoma North. Agriculture as a principle activity by caretakers was mainly practiced in Bungoma East (87%) while Bunyala sub-county had the least of the same (78%) (Table 1).
Characteristics of children in the study
The mean age of children across the four sub-counties was 14 months. Proportionately, age groups of children 6-11, 12-17 and 18-23 months were comparable and further analysis revealed that there were no significant differences among the age groups in the sub-counties. The proportion of males (53%) in the study sample was marginally higher than that of the females (47%), but this difference was not significant compared between sub-counties (Table 2).
Prevalence of vitamin A deficiency and malnutrition among a sample of infants in Western Kenya
Prevalence of vitamin A deficiency and Creatine-reactive protein
Overall VAD in the study area was 20.1% while the elevated CRP was 18.1% (Fig. 1).
Distribution of children by point prevalence of VAD and CRP across sub-counties
The prevalence of VAD was highest in Bunyala (30.3%, n=120), followed by Bungoma North (20.7%, n=924), Kimilili (17.8%, n=325), and Bungoma East (10.3%, n=113). Comparison of these prevalence, revealed that Bungoma North was significantly higher than Bungoma East (z=2.63, CI=0.03-0.18, p=0.001), while Bunyala was significantly higher than Bungoma North (z=2.40, CI=0.02-0.17, p=0.017), Bungoma East (z=3.77, CI=0.01-3.04, p=0.002) and Kimilili (z=2.86, CI=0.04-0.2, p=0.004). Bunyala had the highest (29.0%) prevalence of sub-clinical inflammation as indicated by elevated CRP (>5 mg/L) with Bungoma North having the least prevalence (15.3%) (Table3). Comparison of sub-clinical inflammation prevalence revealed that Bungoma East had significantly higher prevalence of sub-clinical inflammation compared to Bungoma North (z=1.96, CI=0.00-0.09, p=0.005), while Bunyala had significantly higher prevalence of sub-clinical inflammation compared to Bungoma North (z=3.77, CI=0.066-0.21, p=0.000) (Table 3). Mean (geometric[+ or -] SD) level of RBP was adequate in this population (1.56[+ or -]0.79[micro]mol/L) and the level (geometric mean[+ or -] SE) of CRP was within normal range (1.06[+ or -]4.95 mg/L).
Prevalence of malnutrition across sub-counties
Overall, stunting in children was 24% while those wasted were 6%. Stunted children (both moderate and severe) was highest in Bunyala (29.0%), followed by Kimilili (26.1%), Bungoma North (24.8%) and least in Bungoma East (20.4%). Further analysis, showed that there were no significant differences in moderately stunted children between sub-counties, although severely stunted children were significantly higher in Bungoma North compared to Bungoma East (z=3.10, 95% CI (0.044-0.20), p=0.002), significantly higher in Bunyala compared to Bungoma East (z=3.77, 95% CI (0.091-0.29), p=0.000) and significantly higher in Bunyala compared to Kimilili (z=2.71, 95% CI (0.030-0.19), p=0.006). Bunyala had highest prevalence of severely stunted children followed by Bungoma North. In wasted children, whether moderate or severe, there were no significant differences between sub-counties (Table 4).
Caretaker's knowledge scores by individual and household characteristics
Caretakers' knowledge about health seeking behaviors and childcare was significantly associated with age ([chi square] =9.5, df=4, p=0.049), that is, the older the caretaker the more knowledgeable. Highest level of formal education attained by caretaker was strongly associated with knowledge about health seeking behaviors ([chi square] =25.5, df=2 p=0.000) and childcare and nutrition and VA ([chi square] =3.3, df=2p=0.000). Caretakers in monogamous marriages were more knowledgeable about health-seeking behaviors and childcare ([chi square]=13.9, df=6, p=0.030), than about nutrition and VA. Caretakers who practiced agriculture as a principal activity were more knowledgeable about health-seeking behaviors and childcare ([chi square]=6.8, df=2, p=0.033), but not about nutrition and VA. Caretakers with smaller household sizes were more knowledgeable about nutrition and VA ([chi square]=9.0, df=4, p=0.049). Caretakers in the highest wealth quintile were highly knowledgeable in health-seeking behaviors and childcare ([chi square]=26.9, df=4, p=0.000) and about nutrition and VA ([chi square] =3.9, df=4, p=0.000) (Table 5).
Child-feeding practices by sub-counties
Caretakers who initiated breastfeeding immediately or within the first hour after birth were highest in Bunyala (59%) while Kimilili had the lowest (34%). Caretakers who initiated breastfeeding after the first day were highest in Kimilili (37%) and lowest in Bunyala (11%). The average age at which complementary foods were introduced was comparable in Kimilili, Bungoma North, and Bungoma East (< 5 months) but in Bunyala it was comparatively higher (5.45 [+ or -]1.6 months). The first complementary food introduced across the sub-counties by majority (>90%) of caretakers was porridge, which was primarily cereals, except in Bunyala where the majority of caretakers fed varied types of porridges; 18% were providing commercially fortified foods, the highest proportion compared to other sub-counties, and 17% gave porridge made from cereals only (Table 6). Generally, child-feeding practices were better in Bunyala, although this was not reflected in both VA and nutritional status of children from this sub-county.
Household vitamin A food consumption frequency in the study area
The HKI VA child food consumption frequency score was below the threshold, indicating VAD among the children aged 6-23 months. The mean number of days the children consumed VA rich foods from animal sources was 1.7 days/week while the HKI frequency score was 3.3 days. 90% of the children had a HKI food frequency score lower than the minimum threshold of more than 6 days/week. Consumption of VA did not vary with the households' wealth status and with the levels of education of the caretakers. Although there were no significant differences among sub-counties, consumption of VA rich animal sources continued to be lowest in Bunyala sub-county (less than 1 day in a week) (Table 7).
Potential Predictors of vitamin A deficiency in children 6-23 months in study area
Five independent potential predictors of VAD; child location (sub-counties), child's age, child's VA capsule intake 1 year before the survey, caretaker's vitamin A and nutrition knowledge, and caretaker's SES were retained in the multivariate analysis. The child's location was a predictor of VAD in all the sub-counties, where Bunyala showed the strongest predictor for a child developing VAD (Adjusted odds ratio=3.5, CI =1.7-6.9, p=0.000), this was followed by Bungoma North (Adjusted odds ratio=2.2, CI=1.2-3.9, p=0.011), then Kimilili (Adjusted odds ratio=1.9, CI=1.0-3.7, p=0.045). This shows that among the four sub-counties, a child residing in Bunyala had the highest risk of developing VAD and least risk in Bungoma East. The child's age was a significant predictor of VAD (Adjusted odds ratio=1.3, CI=1.1-1.9, p=0.035), where the odds of being VAD increases with age of child; thus children 18-23 months were 1.3 times more likely to develop VAD compared to those aged 6-11 months. Children who had not taken VA capsule within 1 year prior to the survey were 1.3 times more likely to develop VAD compared to those who had taken (Adjusted odds ratio=1.3, CI=1.1-1.7, p=0.022). The VA and nutrition knowledge was found to be a significant (Adjusted odds ratio =1.4, CI=1.0-1.9, p=0.027) predictor of VAD for those in the lowest tertile. Thus, mothers in the lowest tertile of knowledge were 1.4 times more likely to have their children develop VAD (Table 8).
This study has shown that VAD prevalence (20.1%), indicated by RBP <0.825 [micro]mol/L is a public health concern and requires public health intervention among this age of children . These findings are comparable with the neighbouring province of Nyanza where VAD prevalence is about 23% among children 6-59 months , but sharply contrast the national figure of 62.1% . Using WHO categorization, Bunyala (30.3%) and Bungoma North (20.7%) were severely affected by VAD; Kimilili (17.8%) was moderate to severe, while Bungoma East (10.3%) was moderate to mild. In terms of location, children in Bunyala and Bungoma North were most affected, with Bunyala showing the strongest predictor of VAD. Findings that caretakers in Bunyala are better in feeding and care practices compared to the other 3 subcounties may need further investigation because this sub-county showed the highest VAD and poor nutritional status. This could have been due to other epidemiologic traits that tend to characterize most situations where VAD occurs as a public health problem such as ecological, social factors and disease patterns. Furthermore, the differences among sub-counties confirm it as a public health problem, VAD occurs under certain underlying risk factors which tend to cluster and are not uniformly distributed . This possibly reflects a convergence of several risk factors that precipitate VAD in the surrounding child population. Severely sub-clinically deficient populations of children up to 5 years of age, based on the distribution of serum retinol concentrations, are considered to be at risk of severe morbidity and mortality . This is reflected in Bunyala where more than half of children (data not presented here) were reported to have been ill with fevers two weeks prior to the survey, and those who had been hospitalized for illness and suffered from measles was highest in Bunyala district, 15% and 5%, respectively. Results contradict the regressed-based estimates by WHO where Kenya as a whole has been categorized as severely or moderately affected by VAD . Such projections may not be helpful to local situations and may hamper focused interventions for VAD, best initiated at national and local level. In fact, recent studies, have suggested that these projections need to be updated, in order to take into account more recent VAD prevalence and covariates that measure health status and development .
Even though retinol concentration is the recommended biomarker indicator of vitamin A status in a population, it is expensive to measure because of its high sensitivity and hence the need to use HPLC which might not be available in resource-limited and field settings. Retinol binding protein is the primary carrier of retinol in the blood and has been used in various studies as a surrogate indicator of vitamin A status in the population. The RBP has advantages of being less expensive to measure and quite robust under field conditions including exposure to heat and light. However, a primary short-coming of RBP is the lack of universally acceptable cutoff for defining VAD, hence making comparisons and interpretations of results across different populations is complicated. For our study, we applied a cut-off of <0.825 gmol RBP/L for children (corresponding to <0.70 gmol retinol/L) . Secondary limitation of RBP is ability to act as a negative acute phase protein; we adjusted for this effect of infection/inflammation by applying a CRP cut-off of >5.0mg /L.
Taking a VAC in the last 1 year preceding the survey was an important predictor for VAD. This predictor is a pointer to the failure to reach the recommended VAC coverage and that VAD could be responsible for the high mortality rate that is present in Western Kenya among under five children. Despite National efforts by the Kenyan government to access VA supplements to children through its National Food and Nutrition Security Policy , Western Kenya has an alarmingly low VA supplementation coverage (19.8%) in the country with a persistent VAD problem. Additionally, western Kenya has the second highest under-five mortality rate of 121/1,000 live births . To increase vitamin A supplementation coverage, WHO recommends integration of VA supplementation within the Expanded Programme on Immunization (EPI) . UNICEF, recommends regular dosing with VAC for children 6 months to 5 years where over 70/1,000 children die before the age of 5 years . A study from 28 sub-Saharan African countries found that vaccination programs could provide a platform to substantially increase coverage of non-vaccine interventions such as VAC .
The child's age was found to be a significant predictor of VAD. Children 6-11 months are more frequently on breast milk compared to 18-23 month old ones. Because breast milk is unadulterated and provides retinol in a readily absorbable form, this age group is less likely to experience factors that precipitate VAD. Furthermore, the mother's antibodies in breast milk provide immunity to disease. Neonates are currently not given VA supplements because studies have shown no justification in neonatal VA supplementation as a public health intervention in developing countries such as Kenya for reducing infant mortality and morbidity . Even though clinical VAD rarely occurs as long as a child is receiving breast milk, depletion of an infant's body stores, leading to subclinical VAD and consequent health risk, may occur by six months of age when maternal VA status is inadequate and thus breast milk VA is low .
Results show that on average, children were first given complementary food at 4.64 [+ or -] 2.05 months of age. The first complementary food given to children in the study was porridge (Cereal) with nothing else added. Results further show that approximately 90% of the children had a HKI food frequency score lower than the minimum threshold of more than 6 days per week. These results are in agreement with those of WHO which found that the diet of a newly weaned child frequently has very little VA and that until a child has begun receiving a diversified family diet, thus the post weaning period is one of great vulnerability to VAD .
Highest level of formal education attained was strongly associated with knowledge about 1) health-seeking behaviors and childcare, and 2) nutrition and vitamin A. Furthermore, caretaker's knowledge about vitamin A and nutrition was an important predictor for child VAD. Mothers in the lowest tertile of knowledge on VA and nutrition were 1.4 times more likely to have their children develop VAD compared to those in the highest tertile. These findings are in agreement with those from the Kenya Demographics Health Survey , where the education level of the mother was positively correlated with consumption of VA-rich foods. Under-educated, impoverished women tend to follow traditional ideas and practices, and are less confident in engaging in social interactions where more modern concepts and practices are promoted. Due to under-education, they are less likely to learn from educational materials typically displayed at health centers and used in health-related community educational activities, including those concerned with appropriate childcare and feeding practices .
Prevalence of VAD in this sample of infants was high and is of public health concern. Child location and age, taking VAC and knowledge of caretakers are important predictors of VAD in Western Kenya. Although nutritional status did not feature as a predictor for VAD, it was, nonetheless, a public health problem in the study area. Regarding child location and VAD, the distribution of VAD in western Kenya is not uniform but varies from one sub-county to another. Older children were at risk of developing VAD particularly those who had stopped breastfeeding.
These findings require varying intervention approaches according to circumstances that are influenced by child location which is in line with the current call for nutrition-specific and nutrition-sensitive interventions and programs. It is, therefore, important to further investigate the factors that are contributing to VAD particularly in parts of Bungoma North and Bunyala. There is need to educate caretakers on breastfeeding particularly just after the introduction of complementary foods. Taking VAC on a short-term basis is necessary in Western Kenya to reinforce dietary approaches in such severely deficient populations, utilizing, where possible, primary health care services, particularly in severe cases as in Bunyala sub-county. If VAC distribution is done along the EPI as a government policy, then there is a need to establish why low VAC distribution coverage exists in Western Kenya.
We acknowledge the support of Kenya National Bureau of Statistics who provided the sampling frame. Support from local administration on community mobilization is highly appreciated. We are grateful to the field enumerators, drivers and participating households. Thanks to Dean Garrett (PATH, Seattle), who trained the laboratory technicians on blood sampling.
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Oyunga MA (1) *, Grant FKE (2), Omondi DO (3), Ouedraogo H (2), Levin C (4) and JW (2) Low
Corresponding author email: email@example.com
(1) Kenya Agriculture & Livestock Research Organization, Kibos, Kenya
(2) International Potato Center, Nairobi, Kenya
(3) Department of Nutrition and Health, Maseno University, Kenya
(4) University of Washington, Seattle, WA; PATH, Seattle, WA, USA
Table 1: Characteristics of caretakers of children 6-23 months in western Kenya sub-county Bungoma North (n=987) B. East (n=136) n % n % Household size 5.81 2.12 6.01 2.12 0-5 496 50.3 60 44.1 6-10 462 46.8 72 52.9 11-16 29 2.9 4 2.9 Age (years) 30.091 8.92 30.381 9.22 Below 35 755 76.5 99 72.8 36-50 199 20.2 32 23.5 Above 50 33 3.3 5 3.7 Currently in school Yes 33 3.3 3 2.2 No 954 96.7 133 97.8 Formal educ. (Yrs) 8.0 (1) 3.0 (2) 7.6 (1) 3.0 (2) Highest education None 24 2.4 7 5.2 Primary 678 68.7 92 67.7 Secondary 256 25.9 35 25.7 College 18 1.8 2 1.5 Graduate 11 1.1 -- -- Marital status Monogamous 796 80.7 109 80.2 Polygamous 191 19.4 27 19.9 Agric. principal 760 79.3 115 87.1 activity sub-county Kimilili (n=355) Bunyala (n=152) n % n % Household size 5.81 2.12 5.71 2.32 0-5 172 55.3 84 55.3 6-10 174 40.1 61 40.1 11-16 9 4.6 7 4.6 Age (years) 28.41 7.92 29.911 6.72 Below 35 6 83.9 138 90.8 36-50 298 13.5 12 7.9 Above 50 489 2.5 2 1.3 Currently in school Yes 15 4.2 3 2.0 No 340 95.8 149 98.0 Formal educ. (Yrs) 8.2 (1) 2.9 (2) 6.8 (1) 3.1 (2) Highest education None 3 0.9 12 7.9 Primary 250 70.4 115 75.7 Secondary 95 26.8 23 15.1 College 3 0.9 2 1.3 Graduate 4 1.1 -- -- Marital status Monogamous 273 76.9 103 67.8 Polygamous 82 23.1 49 32.2 Agric. principal 279 83.0 108 77.7 activity (1) Mean, (2) (SD) Table 2: Characteristics of a sample of children aged 6-23 months in western Kenya sub-county Bungoma North (987) Bungoma East (136) n % n % Age (mo): 14.0 (1) 5.1 (2) 13.7 (1) 4.7 (2) 6-11 373 37.8 50 36.8 12-17 316 32.0 51 37.5 18-23 298 30.2 35 25.7 Sex: Female 465 47.1 67 49.3 Male 522 52.9 69 50.7 sub-county Kimilili (355) Bunyala (152) n % n % Age (mo): 13.7 (1) 4.9 (2) 13.7 (1) 5.0 (2) 6-11 142 40.0 59 38.8 12-17 116 32.7 52 34.2 18-23 97 27.3 41 27.0 Sex: Female 183 51.6 81 53.3 Male 172 48.5 71 46.7 Mean (1) (SD) (2). There is statistical difference p<0.05); 2-sample proportion z-test; 95%CI Table 3: Distribution of children by point prevalence of VAD and CRP across sub-counties sub-county Bungoma Bungoma North (924) East (113) Indicator n % n % VAD 191 20.7 12 10.3 CRP > 5mg/L 141 15.3 24 21.3 sub-county Kimilili Bunyala (325) (120) Indicator n % n % VAD 58 17.8 36 30.3 CRP > 5mg/L 65 20.0 35 29 There is statistical difference p<0.05); 2/sample proportion z/test; 95%CI. RBP <0.825 [micro]mol/L which is biologically equivalent to 0.7 pmol/L of retinol; values have been adjusted for the influence of sub/clinical inflammation (CRP [greater than or equal to] 5mg/L) Key: VAD--Vitamin A Deficiency; CRP--C-Reactive Protein; RBP--Retinol Binding Protein Table 4: Nutritional status among a sample children aged 6-23 months in Western Kenya sub-county Nutritional Bungoma North Bungoma East status (987) (136) n % n % Stunted Moderate 167 17.0 19 13.8 Severe 77 7.8 9 6.6 Wasted Moderate 48 4.9 6 4.6 Severe 19 1.9 3 2.0 Nutritional Kimilili Bunyala status (355) (152) n % n % Stunted Moderate 67 18.7 31 20.5 Severe 26 7.4 13 8.5 Wasted Moderate 17 4.9 9 5.7 Severe 10 2.7 1 0.6 There is statistical difference p < 0.05); 2-sample proportion z-test; 95% CI Table 5: Women's knowledge scores by individual and household characteristics Women in the highest tertile of knowledge about hsb and child care n=257 (15.8%) [chi square] n % (df) P Age (years): < 35 206 80.0 9.529(4) 0.049 * 36-50 43 17.0 > 50 8 3.0 Highest educ. completed Primary or lower Higher than primary 159 62.0 24.49(2) 0.000 * 98 38.0 Marital status Married monogamous 193 75.0 13.93(6) 0.030 * Married polygamous 18 7.0 Single 29 11.0 Other 17 7.0 Agric. principal activity: No Yes 188 73.2 6.826(2) 0.033 * 55 21.4 Household size 0-5 139 54.1 4.675(4) 0.322 6-10 109 42.4 11-16 9 3.5 HHs wealth tertiles Poorest 84 32.7 26.89(4) 0.000 Middle 75 29.2 Least poor 98 38.1 Women in the highest tertile of knowledge about nutrition and vitamin A n=541 (33.8%) [chi square] n % (df) P Age (years): < 35 425 78.6 5.462(4) 0.243 36-50 101 18.7 > 50 15 2.8 Highest educ. completed Primary or lower Higher than primary 243 44.9 3.266(2) 0.000 * 298 55.1 Marital status Married monogamous 438 81.0 6.747(6) 0.345 Married polygamous 48 8.9 Single 42 7.8 Other 13 2.4 Agric. principal activity: No Yes 408 75.4 2.992(2) 0.224 114 21.1 Household size 0-5 260 48.1 8.981(4) 0.049 * 6-10 269 49.7 11-16 12 2.2 HHs wealth tertiles Poorest 186 34.4 3.921(4) 0.000 * Middle 153 28.3 Least poor 196 36.2 * There is statistical difference p < 0.05; Pearson's [chi square] test. Health seeking behaviours (hsb) Table 6: Child-feeding practices in the selected study sites in Western Kenya sub-county Kimilili (n=355) n % Time after birth baby put to the breast? Immediately 53 15.0 Within the first hour 66 18.7 After first hour, 103 28.9 within the first day After the first day 133 37.4 Age at first 4.841 [+ or -] 1.92 complementary foods Food first given as complementary (%) Porridge 324 91.3 Irish potato 6 1.6 Avocado 6 1.6 Bananas 5 1.3 Other 15 4.2 If porridge, specify type Cereals and nothing else 165 46.4 Cereals and milk 59 16.5 Cereals and other 45 12.8 energy and milk Cereals and proteins 9 2.5 Commercially fortifies 16 4.5 foods only Cereals and proteins 14 4.0 and milk sub-county Bunyala (n=152) n % Time after birth baby put to the breast? Immediately 41 27.0 Within the first hour 49 32.2 After first hour, 45 29.9 within the first day After the first day 17 10.9 Age at first 5.45 [+ or -] 1.6 complementary foods Food first given as complementary (%) Porridge 145 95.5 Irish potato 3 1.7 Avocado 0 0 Bananas 2 1.1 Other 3 1.7 If porridge, specify type Cereals and nothing else 25 16.7 Cereals and milk 9 6.0 Cereals and other 1 0.6 energy and milk Cereals and proteins 12 7.7 Commercially fortifies 27 17.9 foods only Cereals and proteins 5 3.6 and milk sub-county Bungoma North (n=987) n % Time after birth baby put to the breast? Immediately 171 17.3 Within the first hour 203 20.6 After first hour, 299 30.3 within the first day After the first day 314 31.8 Age at first 4.45 [+ or -] 2.1 complementary foods Food first given as complementary (%) Porridge 913 92.5 Irish potato 18 1.8 Avocado 10 1.0 Bananas 6 0.6 Other 40 4.1 If porridge, specify type Cereals and nothing else 437 44.3 Cereals and milk 194 19.7 Cereals and other 105 10.6 energy and milk Cereals and proteins 63 6.4 Commercially fortifies 40 4.1 foods only Cereals and proteins 27 2.9 and milk sub-county Bungoma East (n=136) n % Time after birth baby put to the breast? Immediately 24 17.6 Within the first hour 41 30.4 After first hour, 42 31.1 within the first day After the first day 28 20.9 Age at first 4.56 [+ or -] 2.0 complementary foods Food first given as complementary (%) Porridge 114 84.0 Irish potato 3 2.0 Avocado 2 1.3 Bananas 3 2.0 Other 15 10.7 If porridge, specify type Cereals and nothing else 90 66.1 Cereals and milk 20 14.5 Cereals and other 9 6.5 energy and milk Cereals and proteins 4 3.2 Commercially fortifies 0 0 foods only Cereals and proteins 4 3.2 and milk (1) mean (2) SD [+ or -] Table 7: Household vitamin A food consumption frequency among children aged 6-23 months Total (days/week) consumed animal VA source mean Std dev median Overall Overall (n=1630) 1.61 2.33 1.00 By sub-County Kimilili (n=355) 1.59 2.35 1.00 Bunyala (n=152) 2.05 2.60 1.00 Bungoma North (n=987) 1.61 2.34 1.00 Bungoma East (n=136) 1.25 1.95 0.50 By wealth status Lowest (n=323) 1.82 2.52 1.00 Second (n=333) 1.55 2.32 1.00 Middle (n=299) 1.43 2.19 1.00 Fourth (n=316) 1.59 2.28 1.00 Highest (n=332) 1.68 2.36 1.00 By education level of caretaker None (n=59) 1.76 2.14 1.00 Primary (n=1020) 1.66 2.43 1.00 Secondary (n=490) 1.46 2.13 1.00 College/graduate (n=61) 1.53 1.86 1.00 Total days/week VA from animal <4days per week 1783 (a) 89.5 (b) >4 days per week 210 10.5 HKI food frequency score < 6 days per week 1744a 89.8b >6 days per week 198 10.2 HKI VA food consumption frequency score mean Std dev median Overall Overall (n=1630) 3.30 2.64 2.50 By sub-County Kimilili (n=355) 3.16 2.66 2.33 Bunyala (n=152) 3.03 2.81 2.17 Bungoma North (n=987) 3.44 2.64 2.67 Bungoma East (n=136) 2.94 2.30 2.33 By wealth status Lowest (n=323) 3.51 2.84 2.67 Second (n=333) 3.26 2.64 2.50 Middle (n=299) 3.09 2.45 2.33 Fourth (n=316) 3.25 2.60 2.50 Highest (n=332) 3.40 2.65 2.67 By education level of caretaker None (n=59) 3.36 2.31 3.00 Primary (n=1020) 3.34 2.72 2.50 Secondary (n=490) 3.18 2.49 2.50 College/graduate (n=61) 3.25 2.25 2.83 Total days/week VA from animal <4days per week >4 days per week HKI food frequency score < 6 days per week >6 days per week (a) represents number of children (b) is the proportion of children (%) Key: HKI-Helen Keller International; VA-Vitamin A Table 8: Multivariate logistic regression analysis for predictors of VAD in children 6-23 months in study area Variables retained No VAD- in logistic n = 1303 VAD n=327 regression analysis (79.9%) (20.1%) p-value sub-County Bungoma East 122 (89.7) 14 (10.3) Ref Bunyala 106 (69.7) 46 (30.3) 0.000 * Bungoma North 783 (79.3) 204 (20.7) 0.011 * Kimilili 292 (82.2) 63 (17.8) 0.045 * Child Age 6-11 509 (81.6) 115 (18.4) Ref 12-17 433 (80.9) 102 (19.1) 0.389 18-23 361 (76.7) 110 (23.4) 0.035 * Child taken VA capsule in the last 1 year No 803 (81.9) 177 (18.1) 0.022 * Yes 449 (78.1) 126 (21.9) Ref Vitamin A and nutrition knowledge score Lowest tertile 446 (77.3) 131 (22.7) 0.027 * Second tertile 411 (80.3) 101 (19.7) 0.617 Highest tertile 446 (82.4) 95 (17.6) Ref Socio Economic Status (SES) Poorest 559 (79.0) 149 (21.1) 0.088 Middle 354 (78.5) 97 (21.5) 0.074 Least poor 378 (83.1) 77 (16.9) Ref Variables retained in logistic Adjusted odds regression analysis ratio (95%CI) sub-County Bungoma East Ref Bunyala 3.5 (1.7-6.9) Bungoma North 2.2 (1.2-3.9) Kimilili 1.9 (1.0-3.7) Child Age 6-11 Ref 12-17 1.1 (0.8-1.6) 18-23 1.3 (1.1-1.9) Child taken VA capsule in the last 1 year No 1.3 (1.1-1.7) Yes Ref Vitamin A and nutrition knowledge score Lowest tertile 1.4 (1.0-1.9) Second tertile 1.0 (0.7-1.5) Highest tertile Ref Socio Economic Status (SES) Poorest 1.4 (0.9-1.9) Middle 1.3 (0.9-1.8) Least poor Ref * There is statistical difference p<0.05; Pearson's [chi square] test Key: VAD-Vitamin A Deficiency; CRP-C-Reactive Protein; RBP-Retinol Binding Protein Figure 1: Distribution of children by overall V AD and CRP prevalence Proportion VAD 20.06 Elevated CRP 18.1 Note: Table made from bar graph.
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|Author:||Oyunga, Mary Anyango; Grant, F.K.E; Omondi, D.O.; Ouedraogo, H.; Levin, C.; Low, J.W.|
|Publication:||African Journal of Food, Agriculture, Nutrition and Development|
|Date:||Mar 1, 2016|
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