Design: nationwide internet-based caregiver survey with standardised instruments (Dysfunctional Voiding Symptom Score, Rome III, Bristol Stool Form Scale)
Population: 3,100 analysed responses for children aged 6–15 years — 1,513 girls, 1,587 boys
Primary outcome: prevalence of daytime lower urinary tract symptoms, nocturnal enuresis and bowel dysfunction
Effect: daytime symptoms 17.5% (urgency commonest, higher in boys); nocturnal enuresis 5.1% (higher in boys, falling with age); chronic functional constipation 14.0% with no sex difference

Paediatric bladder and bowel dysfunction is mostly managed from clinical impression, because contemporary prevalence data using standardised definitions barely exist. A nationwide internet survey of caregivers of children aged 6 to 15 supplies some, with 3,100 analysable responses covering 1,513 girls and 1,587 boys, using the Dysfunctional Voiding Symptom Score, the Rome III criteria and the Bristol Stool Form Scale.

Daytime lower urinary tract symptoms were present in 17.5% of children, with urgency the commonest and boys affected more often than girls. Nocturnal enuresis was reported in 5.1%, again more frequent in boys across every subtype — monosymptomatic and non-monosymptomatic, primary and secondary — and falling significantly with age in both sexes. Chronic functional constipation by Rome III criteria was found in 14.0%, with no sex difference.

The number worth carrying is the constipation one, sitting alongside the urinary figures in the same children. Bladder and bowel dysfunction travel together, and constipation is the more treatable half — yet a child referred for daytime wetting or urgency often reaches a urology clinic without anyone having taken a stool history. Putting a Bristol Stool Form Scale question into the first assessment is close to free, and in a proportion of these children treating the constipation is the whole intervention.

Take a stool history in every child presenting with daytime urinary symptoms or enuresis.
Use the Bristol Stool Form Scale and a frequency question rather than asking whether the child is constipated.
Score symptoms formally with the Dysfunctional Voiding Symptom Score so response is measurable.
Expect enuresis to improve with age; that is the natural history, not necessarily the treatment working.
Treat constipation first where both are present — it is the more tractable of the two.

Why it matters

It puts a number on how common these symptoms are, and shows constipation sitting at almost the same prevalence as the urinary complaint that gets referred.

The statistics, in plain English

These are caregiver-reported prevalences from an internet survey, so they measure what parents notice and report rather than what a clinician would diagnose — likely an underestimate for daytime symptoms a child conceals and an overestimate for anything a worried parent over-reports. There is no comparison group and no adjustment; these are descriptive figures. The falls with age and the sex differences are internally consistent with what is known, which is mild reassurance about the sample, but a Japanese internet panel is not a random sample of children anywhere.