We did a retrospective study of the prevalence of nocturnal and diurna
l enuresis in patients with attention-deficit hyperactivity disorder (
ADHD). Patients with ADHD were identified at a referral center for dev
elopmental pediatrics. Control patients were identified at a general p
ediatric and pediatric allergy clinic. Adjusting for differences in se
x and current age, ADHD children at age 6 were 2.7 times more likely t
han controls to have nocturnal enuresis and 4.5 times more likely to h
ave diurnal enuresis. Results at children's current age were consisten
t with results at age 6; however, these differences were not statistic
ally significant. Nocturnal and diurnal enuresis was found to be signi
ficantly more common in children with ADHD than in control subjects. P
hysicians who treat patients with ADHD should routinely inquire about
the presence of enuresis.