Secular changes in growth and development vary over past decades in in
tensity and in trend. The purpose of this paper is to present changes
in growth patterns of Zagreb schoolchildren aged 7-19 years over the p
ast four decades. Surveys were performed in 1951, 1964, 1973, 1982 and
1991. The mean height of boys and girls in all observed groups has in
creased significantly over the 40-year period. Age groups up to 9 year
s in 1991 were 4-7.5 cm taller than their coevals in 1951. Differences
increased from the age of 10 in girls and 12 in boys, reaching 10 cm
in girls of 12 years and even 14 cm in boys of 14 years. They were als
o highly pronounced in adult height (5 cm in girls, 7 cm in boys). The
most pronounced changes appeared from 1951 to 1964, while in the peri
od from 1964 to 1973 the increase was smaller; in girls only up to 13
years, in boys to 17 years. However, between 1973 and 1982 positive ch
anges were again significantly pronounced, especially in the older age
groups. In the last period, 1982-91, the trend seemed to come to an e
nd. Changes in average weight mostly corresponded to the height change
s, being somewhat greater in boys. Moreover, in the last two periods,
weight gain in older girls was smaller compared to height. Menarche in
the period 1964-73 shifted to a younger age by 8 months (13.34-12.67
years), retaining the same level over the next 9 years. However, since
1982 a slight reverse trend has been noticed.