[Age characteristics and circadian biorhythm of the leukocytes in schoolchildren]

The leucocyte counts were determined three times daily at 6 hours' interval in 480 children from 7 to 14 years of age (30 boys and 30 girls of each age group). The results showed that there exist no age or sex differences in the leucocyte counts in school-children. There was essential increase in the leucocyte counts in boys and girls from morning to evening. These data should be taken into consideration, when results of repeated determinations throughout the the day in clinical practice, sport medicine and research work are to be interpretted.