The Khasis are one of the matrilineal tribes of Meghalaya in Northeast India. They belong to the Indo-Mongoloid racial stock, and speak the Monkhmer language of the Austro-Asiatic group. They have their own traditional religion (Niam Khasi), but about 65% of them have converted to Christianity. A few Khasi members have also embraced Islam through matrimonial relationship with immigrant Muslim males. The present study was based on a cross-sectional sample of 1,351 urban Khasi boys aged 3-18 years belonging to these three religious groups, with a view to understanding the effects of socioeconomic factors on growth and nutritional status, using anthropometric variables such as weight and height. The findings showed that about 60%, 29%, and 6% of these boys were below -2 Z-scores of the US National Center for Health Statistics (NCHS) references in respect of weight for age, height for age, and body mass index for age, respectively. The logistic regression coefficient (beta +/- standard error) indicated that the prevalence of low weight for age (below -2 Z-scores of the NCHS references) was positively associated with age (0.088 +/- 0.014, P<0.0001), while it was inversely associated with household income (-1.216 +/- 0.030, P<0.0001). Likewise, low height for age Z-score was negatively associated with household income (-1.056 +/- 0.130, P<0.0001), although such a relationship was not significant in the case of low body mass index for age (-0.169 +/- 0.229, P>0.05). There were also significant differences between religious groups in respect of anthropometric variables. Allowing for household income, the ANCOVA test indicated that Muslim Khasi boys, who were the offspring of intermarriages between Khasi females and immigrant Muslim males, were significantly heavier and taller than Christian and Niam Khasi boys almost across ages. From about 3-10 years of age, Muslim Khasi boys were, on average, comparable to the 5th and 25th percentiles of the NCHS references of height and weight, respectively. Although it looks as though genetic mechanisms like heterosis and/or gene flow might also be associated with the larger body size in Muslim boys, such a conjecture could only be substantiated or refuted by further studies concerning genetic and more socioeconomic data on both immigrant and nonimmigrant populations.

Objective: To determine the sex differences in chronic energy deficiency (CED) among adolescents in the context of patrilineal and matrilineal societies in Northeast India. Design: Cross-sectional, community-based study of the Hmar patrilineal society and the Khasi (War and Khynriam) matrilineal society. Setting: Mizoram and Meghalaya in Northeast India. Subjects: In total, 1733 adolescent boys and girls aged 9-16 y: Khynriam Khasis (n ¼ 1005), War Khasis (n ¼ 305) and Hmars (n ¼ 423). Measurements: Weight, height, and socio-economic characteristics. Body mass index (weight in kg/height in m 2 ) was used for assessing CED relative to the international reference values. Results: The overall prevalence of CED was significantly greater in boys than in girls. The sex differences in the prevalence of CED were 5, 10 and 6% points in the Khynriam Khasis, War Khasis and Hmars, respectively. Allowing for age and socio-economic variables, the risks of CED were about 1.82 (95% CI 1.14-2.90), 1.83 (95% CI 1.19-3.33) and 1.78 (95% CI 1.10-3.25) times greater in boys than in girls among the Khynriam Khasis, War Khasis and Hmars, respectively. Using logistic regression analysis, the prevalence of CED was negatively associated with family income across study populations. No significant association was found between CED and religion. Conclusion: Patrilineal and matrilineal forms of society were not reflected in the prevalence of CED among adolescents. Subject to further studies of the research problems concerning the nutritional status of adolescents, girls fare better than boys with respect to the prevalence of CED.

Subject to further studies, the role of heterosis and/or gene flow in influencing growth and development of children cannot be completely ruled out, especially after 5 years of age when the variation in growth patterns is likely to be associated not only with environmental quality but also with genetic mechanisms.

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