Enuresis may be defined as an involuntary discharge of urine by day or night, or by both, in the absence of congenital or acquired defects of the central nervous system or urinary tract in a child aged 5 or over. Oppel et al in their study of 859 children showed that 10% were wetting at age 7 and the National Child Development Study of all children born in England during a week in 1958 showed o...