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).
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.
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).