and, the complete anthropometry was recorded when it was
first noticed by the investigators, whereas the actual onset
may have occurred anytime between this follow-up and the one
prior to it, thus giving rise to over estimation of average
age, weight or height at onset of any characteristic. Another
constraint was that the study was terminated at a point when
very few children had completed 16 years of age and had not
reached full maturity, thus excluding the late attainers giving
rise to under estimation of average age, weight and height.
The data presented therefore includes percentage of children
attaining the characteristic at cut off points of' 12, 13,
14 and 15 years of age and average age, weight and height
of children at the point when it was first observed.
Sexual maturity in
Appearance of Pubic Hair
The first secondary sexual characteristic to appear in boy
was pubic hair at all the centres. Pubic hair had appeared
in more than 90 percent of boys by the age of 15 years at
all the centres except at Varanasi and Vellore rural, where
about 64 per cent had it by that age (Fig., 37). The mean
age at appearance of pubic hair in the children who had attained
it, was between 11.8 (Chandigarh) to 13.4 (Hyderabad) years,
mean weight between 27.2 (Chandigarh) to 32.9 (Varanasi) kg.
and mean height between 136.6 (Chandigarh) to 144.4 (Varanasi)
cm. (Table 24 ). It was observed that at Varanasi and Vellore
the boys who had attained the characteristic, had higher weight
(about 3 kg.) and height (about 4 cm.) for age as compared
to the weight and height of boys from respective centres from
the same series (Tables 2 & 4).
Appearance of Facial Hair
The next characteristic to appear in boys from all centres
except at Vellore rural was facial hair, which had appeared
in 39 (Hyderabad) to 99 (Chandigarh) per cent of the boys
by the age of 15 years (Fig. 38). The average age at appearance
in these children was between 12.6 (Chandigarh) to 14.4 (Delhi)
years, mean weight 29.5 (Chandigarh) , to 41.6 (Vellore urban
slum) kg. and mean height 140.8 (Chandigarh) to 157.9 (Vellore
urban slum) cm. (Table 25 ). The children in whom facial hair
had appeared had higher weight (2-3 kg.) and height (5-8 cm.)
for age at all centres except at Chandigarh where 99 per cent
boys had facial hair and therefore had similar weight and
height for age (Tables 2 & 4).
Appearance of Axillary Hair
Wide between centres variations in time of appearance of
axillary hair and change of voice were observed.