Urge incontinence is characterized by a higher rate of UTIs, a lower urine volume in uroflowmetry, a lower rate of behavioural scores in the clinical range and well-functioning families. Voiding postponement children, on the other hand, have a higher, though not significant, rate of abnormal uroflow curves, a wide variety of clinically relevant behavioural symptoms, which were significantly higher for attention and delinquent problems. Conduct problems predominated; only 13.7% of the children had attention problems in the clinical range. The findings lend empirical support to the entity of voiding postponement as an acquired or behavioural syndrome characterized by wetting in association with a delay of micturition and other externalizing conduct problems.