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The goals of this study were to describe the pattern of voiding disorders in children in our community, to describe clinical criteria for making the specific diagnoses, and to comment on management. The medical records of 226 children referred because of voiding dysfunction or urinary tract infections (UTI) were evaluated. Children with normal voiding patterns when uninfected, with monosymptomatic nocturnal enuresis, and with known neurologic or anatomic abnormalities were excluded. Detrusor instability, an abnormal voiding pattern characterized by urgency with or without frequency, was the diagnosis in 175 of the 226 children. Children with detrusor instability who used various posturing maneuvers to avoid urinary incontinence had a significantly higher incidence of UTIs than those who did not attempt to obstruct urine outflow. Detrusor instability appeared to be secondary to constipation in 19 of the children. The other diagnoses were extraordinary daytime urinary frequency, infrequent voiding, monosymptomatic daytime wetting, transient voiding dysfunction, giggle incontinence, dysfunctional voiding, and unexplained dysuria. It is concluded that children with detrusor instability who use posturing maneuvers to avoid incontinence are at high risk for recurrent UTIs. Constipation is 1 cause of detrusor instability. Dysfunctional voiding, the form of voiding dysfunction most likely to result in renal damage, was present in only 2 of 226 children seen for voiding disorders.