Data analysis
The total cost per participant was estimated by combining the number of each item of resource used with the unit cost of that item. This provided an estimate of mean cost per participant by treatment group. Differences in mean costs associated with UI products, staff time for toilet assistance and other health care resource use (e.g. GP visits) during routine follow-up were estimated. Independent samples t-test was used to compare resource use by the groups at each time point. Utility change scores were assessed for differences before and after TTNS (6 weeks), at 18 weeks follow up and between groups at each time point.