Hydroxyprolinuria has been measured in 378 normal Zairean children age
d between 3 and 13 years using the Kivirikko's method; 192 of them wer
e boys and 186 were girls. Results show an age-related increase of uri
nary excretion of hydroxyproline in both sexes, girls having higher ab
solute values than boys. However, this difference is pronounced when v
alues are corrected according to body size. Our values are slightly hi
gher than those found in the literature.