Can evidence-based medicine change toilet-training practice?

To assess the evidence showing that a specific method of toilet training (TT) is more effective than others, as any method of TT recommended by a physician faces obstacles because parents rarely request advice on TT from physicians, and TT practices vary tremendously across cultures and socioeconomic levels.

Methods:
Reports on the natural course of urinary incontinence in children and different methods of TT, published in English between 1946 and 2012, were reviewed. Specifically investigated were historical recommendations on TT, the prevalence of urinary incontinence during childhood, the outcome of TT methods, and the effect of culture and socioeconomic status on the choice of TT method and timing.

Results:
TT now occurs at later ages than it did previously. This progression reflects changing ideas about normal childhood physiology and psychology. The prevalence of urinary incontinence in European countries progressively decreased in children aged between 6–7 years and 16–17 years old. TT methods change with increasing socioeconomic levels to ‘child-centred’ techniques applied at older ages, but the prevalence of urinary incontinence after ‘parent-centred’ techniques of TT at younger ages has not been studied. There is currently no evidence that a specific timing or method of TT is more effective or prevents voiding dysfunction.

Conclusions:
Follow-up studies of urinary continence in children toilet trained at 6–12 months of age might provide evidence for whether a given method or timing of TT is beneficial to prevent voiding dysfunction. The recommendations of physicians might be more readily adopted if they fit culturally accepted ideas of good parenting techniques.