To study the prevalence of constipation in young children, and to explore its association with dietary fibre intake. Cross-sectional community-based study. Three kindergartens randomly selected from the eastern district of Hong Kong. Between October 2003 and January 2004, parents of children aged 3 to 5 years completed a specially designed questionnaire and a 3-day dietary record form, which were used to collect information on bowel function and dietary intake. Children with constipation were

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... entified based on Rome criteria. Children with normal bowel habits served as a comparison group. Dietary intake of energy, protein, and dietary fibre. Of 778 children recruited, 561 complete sets of data were successfully obtained from the participating kindergartens. One hundred and sixty-six (29.6%) children were found to be constipated. The incidence of a family history of constipation was significantly higher in the constipated group (14%) than in the non-constipated group (7%) [P=0.013]. Mean dietary fibre consumption was 4.1 g/d (standard deviation, 2.3 g/d) in all children corresponding to 45.5% (standard deviation, 24.9%) of the daily recommendation. Constipated children (mean, 40.7%; standard deviation, 20.5%) had a significantly lower dietary fibre intake of the daily recommendation than the non-constipated group (mean, 47.5%; standard deviation, 26.2%) [P=0.017]. Up to 30% of preschool children in the eastern district had constipation. A family history of constipation was related to its occurrence in the studied children. Dietary fibre intake was insufficient in all children and even lower in those who were constipated.