Cephalic index in newborns: the effect of heredity and sex.
Body proportions and absolute dimensions vary widely with respect to age and sex within and between racial groups. While this is partly due to variability in muscularity and adiposity; such variations are chiefly skeletal; their study is anthropometry. [1,2]
Race, sex, nutritional status and cultural factors affect craniofacial measurements. Out of these sex is a major factor.  Climate and geographical regions also influence head dimensions. [4,5] With respect to variation of head shape in various races and geographical zones, it was observed that hereditary factors primarily affect the shape of head, however environment has secondary effect on it.  Shape of vault is not directly related to the cerebral growth, but to genetic factors. This is supported by great range of cranial indices and shapes in racial groups, however sexual differences are minimal. 
The adaptation of anthropometry for use in medicine has led to improvements in technique of measurements and in location of landmarks, modifications of standard measurements and development of new ones.  Craniometric measurements have a special usefulness in forensic practice where cranial remains can be compared with existing photographic and radiological records in making the identification. 
Anthropometric measurements serve as useful adjuncts to other observations in evaluating intrauterine as well as infant growth and development. 10,111 Dimensions of newborn's body can be the basis for all changes in anthropometric indices. These dimensions are important in this field, because this is one of the new-born health evaluation indices.!6!
There is scarcity of data regarding measurement of these indices in new-borns. Although some anthropometric studies of new-borns have been carried out in other parts of the world, studies on cephalometry have not been carried out in Northern part of India. Also, there is scope for research in various geographical and racial groups. The purpose of our study was to provide a baseline data for Cephalic Index in different endogamous groups and to observe sexual dimorphism, if any in the region around Patiala in Punjab.
MATERIALS AND METHOD
The present study was conducted on 360 normal new-borns born at different gestational ages in Government Medical College and Rajindra Hospital, Patiala. All neonates belonged to similar socioeconomic status to further decrease the effect of external factors and to make the study highly specific. The three endogamous groups taken into consideration were Jat Sikhs, Banias and Majhbi Sikhs. One hundred twenty newborns from each group were selected. Further there were an equal number of male and female neonates (i.e. 180 males and 180 females).
Babies with craniofacial abnormalities (Such as cleft palate, cleft lip, micrognathia, caput succedaneum, cephalhematoma, hydrocephalous, etc.) were excluded.
The various measurements were taken with Martin spreading calipers after taking an informed consent from the parents or the guardians.
Cephalic Index was calculated as a proportion of head width to head length expressed as a percentage as follows:
Cephalic index = Head width X 100/Head length
Where Head width is the greatest breadth at right angles to the median plane.
Head length is the distance between glabella and the farthest occipital point.
The morphological classification of Cephalic Index is as follows. 
All measurements were taken within 24 hours of birth and were taken and recorded by the same observer throughout the study. The data for each new-born was recorded in a special form, compiled and then analysed statistically. The student's 't test and discriminant function analysis were used for statistical analysis.
Data from 360 neonates was grouped under three endogamous groups-Jat Sikhs (n=120), Banias (n=120) and Majhbi Sikhs (n=120).
(Where n is number, min. is minimum, max is maximum, S.D. is for standard deviation and C.V. is for coefficient of variation).
JS and B: p <0.001 (Highly Significant)
JS and MS: p <0.001 (Highly Significant)
B and MS: p <0.001 (Highly Significant)
Table 2 shows that in a study of 360 neonates belonging to three different endogamous groups, the mean Cephalic Index is 82.10[+ or -]0.16 in Jat Sikhs, 78.10[+ or -]0.13 in Banias and 79.30[+ or -]0.12 in Majhbi Sikhs. On statistical analysis the difference is statistically highly significant (p<0.001) among the three endogamous groups. The head form is Mesocephalic in Banias and Majhbi Sikhs whereas it is Brachycephalic in Jat Sikhs.
Table 3 shows that the mean Cephalic index of males (80.07[+ or -]0.18) is higher than that of females (79.61[+ or -]0.15) and this difference is statistically just significant (p <0.05).
Indices of human head and face morphology and derived indices are the main sources of head and facial characteristics that influence human appearance, and are the main basis for recognizing individual's Anthropometric measurements are useful indicators in a population to determine the sexual and racial differences. The Cephalic Index, in particular, is most often utilized for the change in trend of population, which is further influenced by internal and external factors.
In the present study when taken irrespective of race, the dominant head form is mesocephalic, but the endogamous group differentiation is evident and this shows that the shape of head depends on hereditary factors.
In a study in Iran, the difference in Cephalic index in the two races of Iran, i.e. Turkman and Fars is non-significant.[6, 12] However, on comparison with studies on adults in India, significant differences have been observed in Cephalic Index in different endogamous groups.
At the time of birth, Mesocephaly dominated in Banias, Brachycephaly in Jat Sikhs and Dolichocephaly in Majhbi Sikhs. When this data is compared with adults, it seems that Dolichocephaly is the dominant head form of this region. [13,14,15] It can be observed that there occurs dolichocephalization in Jat Sikhs and Banias with age, whereas in Majhbi Sikhs there is no change in shape of head.
The variation in mean Cephalic Index in males and females was found to be just significant. Golalipour et al. (2003, 2005) observed higher values in females. [6,12] The problem; at what age, sex differences appear is of great interest. It is a known fact that sexual dimorphism appears during puberty. In the present study, the data suggests that sex differences are present at the time of birth.
Therefore, these differences have to appear during fetal development.
Cephalometric study is also important in forensic science for the facial reconstruction of disputed identity.  It has also been applied in oral surgery concerned with craniofacial deformity.  It enables quantitative description that is more precise and objective than the current practice of sole reliance on visual impression. Anthropometric studies have been found useful in craniofacial surgery, otorhinolaryngology and syndromology. Perhaps by joining talents, physical anthropometrists and medicine and surgical clinicians will advance the field and improve patient care. This study demonstrates that Cephalic index is determined by genetic and racial factors. Also, sex characters appear during fetal development. It is suggested that efforts are necessary for determining the role of heredity, environment, ageing, sex and racial factors on the shape of head, especially in new-borns. This study can serve as a baseline study and can provide useful criteria for future anthropometric studies.
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Aprajita Sikka (1), Subhash Kaushal (2), Patnaik Vantharam Venlata Gopichand (3)
(1) Associate Professor, Department of Anatomy, Christian Medical College and Hospital, Ludhiana.
(2) Professor, Department of Anatomy, Government Medical College and Rajindra Hospital, Ludhiana.
(3) Professor, Department of Anatomy, Mullana Institute of Medical Sciences and Research, Mullana, Ambala.
Financial or Other, Competing Interest: None.
Submission 11-12-2015, Peer Review 12-12-2015, Acceptance 29-12-2015, Published 02-01-2016.
Dr. Aprajita Sikka, Department of Anatomy, Christian Medical College, Ludhiana.
Table 1 Head Shape Range of Cephalic Index (%) Dolichocephalic Up to 74.9 Mesocephalic 75.0-79.9 Brachycephalic 80.0-84.9 Hyperbrachycephalic 85.0-89.9 Table 2: Cephalic Index in Different Endogamous Groups (Jat Sikhs, Banias, Majhbi Sikhs) n Mean Range Min Max S.D. C.V. Jat Sikhs 120 82.10 77.60 85.86 1.78 2.17 (JS) Banias(B) 120 78.10 73.83 82.52 1.40 1.79 Majhbi 120 79.30 75.96 82.57 1.29 1.63 Sikhs (MS) Table 3: Cephalic Index In Males and Females n Mean Range S.D. C.V. Min. Max. Males 180 80.07 74.07 85.86 2.43 3.03 Females 180 79.61 74.55 84.76 2.07 2.60
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|Title Annotation:||Original Article|
|Author:||Sikka, Aprajita; Kaushal, Subhash; Gopichand, Patnaik Vantharam Venlata|
|Publication:||Journal of Evolution of Medical and Dental Sciences|
|Date:||Jan 4, 2016|
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