Nocturnal enuresis is one of the most frequent, and at the same time one of the most annoying, disorders of childhood (Bakwin, 1961). Eighteen per cent of 1,000 children studied in an Australian community were still bed-wetters at school age (Hawkins, 1962), and it has been estimated that 20% to 26% of. children may be brought before, the family doctor at some period in their lives with the complaint of nocturnal enuresis (Kanner, 1957). Night control of the urinary bladder should be permanent by the age of three to five years, and Hawkins (1962) found the average age of onset of control to be between two and three years. Nocturnal enuresis should not be regarded as abnormal until after the fifth birthday (Patterson and Lightwood, 1957).
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David K. Collison (1970) studied this question.
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