Sample size Since there are no other similar studies, the sample was calculated from a study that instructed children to achieve bowel movements sitting on the toilet. A reduction was encountered of 80% in fecal incontinence in the intervention group and 55% in the control group. The effect on the reduction of fecal incontinence (< one/week) was estimated at 25% in favor of the intervention. Epi-Info 6.04 was employed, using p=5% power=80%, which resulted in 72 participants.