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    Children During Adolescence [10 - 16 Years]
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later age points. The overall gain in MAC varied between centres from 3.6 at rural Vellore to 6.1 cm. at Jabalpur (Table 9). The girls from rural areas were observed to have average MAC higher than boys at all age points till they reached the age of 16 years. The maximum difference was 0.5 cm. observed between 13.5 to 14.5 years. The same was observed in urban slum areas of the study also and the maximum difference in average MAC of boys and girls 1 cm. appeared around 14 years of age (Tables 8 & 9).

Bi-acromial diameter:

Average bi-acromial diameter of boys from urban slum areas covered in this study was significantly higher (P<0.01) as compared to that of boys from rural areas. However it was observed that the boys from urban Vellore though had higher bi-acromial diameter as compare to that of boys from rural Vellore, were comparable to boys from rural Chandigarh and Jabalpur areas. The boys from Vellore rural appeared to have lowest bi-acromial diameter. The average total gain in bi-acromial diameter varied between centres from 4.5 cm. (rural Vellore) to 6.9 cm. at Hyderabad (Table 10).

The girls from urban areas, also had significantly higher bi-acromial diameter (P<0.01) than girls form rural areas included in the study. From among the rural areas girls from Jabalpur had highest bi-acromial diameter and from Varanasi the lowest. The girls from other three rural and Vellore urban slum area were comparable. The between centre differences in average bi-acromial diameters varied between 1.2 cm. to 4.0 cm. at different age points. Total average gain from 10 to 16 years of age varied 4.9 cm. (rural Vellore) to 7.1 cm. at Delhi (Table 11). No difference was observed between boys and girls in either urban or rural groups.

Bi-cristal diameter:

Average bi-cristal diameter of boys as well, as girls from urban areas was significantly higher (P<0.01) than boys and girls from rural areas. Between centre differences in average value for bi-cristal diameter at earlier age to later age points varied from 1.1 to 2.8 cm. for boys and from 1.1 to 3.4 for girls respectively. Total gain in bi-cristal diameter from 10 to 16 years of age varied between 4.0 to 5.8 cm. for boys and from 4.1 cm to 6.3 cm for girls respectively. The girls from both rural and urban areas of this study had higher bi-cristal diameter through-out the adolescent period studied. A difference in average bi-cristal diameter of girls and boys upto 0.6 to 0.8 cm. in rural areas and 1.2 to 1.4 in urban areas was observed between 13 to 15 years (Tables 12 & 13).

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