Voiding school (VS) is based on urotherapy guidelines for educating children with incontinence highlighting regular voiding habits and life-style advice. Learning by doing, understanding the body function by concrete example videos and pictures, and discussing are the main teaching methods.The intervention is delivered face-to-face in groups of 4-6 children. The VS includes three sessions one months apart. Duration of each VS session is three hours. The intervention is delivered with detailed manual. The intervention is provided by an urotherapist and a public-health nurse.

The control group receives treatment according to the new 2016 guidelines of incontinence care in child welfare clinics in the city concerning. Treatment is carried out by public health nurse individually in consulting hours or by telephone.

Children are educated on the kidneys, bladder and bowel function, the importance of regular voiding and drinking habits, and avoidance of constipation. Balloons, books, videos, animations, the pictures of a satisfied and irritated bladder and a poo-cars formula track are used to exemplify the function of urinary and defecation systems. During toilet visits children are given advise about an adequate and relaxed toilet posture with the help of little bench under the feet if needed. Each child also make their own timetable for peeing, pooing, and water drinking times, which they then should learn to follow in day-care, pre-school and at home. At the end of each session child, parent and public health nurse/urotherapist discuss any individual advice and the homework for the next time.

Changes of amount of dry days and nights, is performed with the modified Finnish version of the ICCS one-week voiding diary (©2015 International Children's Continence Society). Children with the help of their parents are asked to mark X in the diary every time they are voiding; M=a little amount of wetting, MM=a bigger amount of wetting, Y=night-time wetting. Bowel movements are marked with K.

Symptom score for dysfunctional elimination syndrome (NLUT-DES questionnaire) is used to evaluate children's voiding and defecation habits associated with incontinence. It is a 14-item 5-point Likert scale questionnaire (0=no symptoms 4=severe symptoms, except item 3: 0=5-6 times, 2= 3-4 or 7-8 times, 4= 1-2 or over 8 times). Official translation into Finnish was performed for this study.

Background information of the participated children (age, sex, dg, duration of incontinence, earlier treatment, constipation) is collected with developed questionnaire.