Clinical data collected from the patient group.

All patients wet the bed only at night. The age is given in years; M = male; F = female.aThese children can wake up after bed-wetting.bThe bladder volume was defined by b-ultrasound results: children with PMNE were asked to try their best to hold back urine for three times while their bladder volumes were measured by b-ultrasound. The largest measured value was defined as the bladder volume.