Voiding Frequency, Volumes and Intervals in Healthy Schoolchildren

Abstract

To study the micturition pattern in healthy schoolchildren, 242 children aged 7-15, who all considered themselves healthy, completed a frequency/volume chart for 24 hours. Bed-wetting occurred in 21 (8.7%) and daytime incontinence in 19 (7.9%) children. Both symptoms occurred in four subjects, all girls. The incontinent children were excluded, leaving 206 subjects in the study. The healthy children voided 2-10 times a day, with 95% having a voiding frequency of 3-8. Twenty-three (11.2%) voided once during the night. All volume parameters varied greatly, both interindividually and intraindividually, independently of sex but weakly correlated to age and body parameters. The morning voiding was the largest, while the last before bedtime was the smallest. The interval between two voidings was longest in the morning decreasing towards the evening. The healthy child has a great ability to adapt the micturition pattern to social activities, which mean-"to be the Boss of the Bladder".