Analysis of secondary outcomes:
A 72-h incontinence episode frequency (IEF), the International Consultation on Incontinence Questionnaire-Urinary Incontinence (ICIQ-UI) Short Form score, and weekly consumption of pads of weeks 6, 18, and 30 will be compared with their respective baselines, and a t-test or non-parametric test will be used for comparison among groups.
For severity of urinary incontinence based on a 72-h bladder diary and a self-report assessment of therapeutic effect, the case number and percentage of each rank of weeks 6, 18, and 30 will be compared with their baselines, and a chi-square test or non-parametric test will be used for comparison among groups.
Although we will exclude patients already receiving some form of treatment for SUI at the trial outset and will discourage participants from taking additional treatments during the trial period, we anticipate that some patients will not adhere to this. In these instances the patients will record the treatments received and/or medications taken and the number of patients and treatment sessions of the treatment period and two follow-up periods will be described, and chi-square tests or non-parametric tests will be used for comparison among groups.
To assess the effect of EA for different degrees of SUI, subgroup analysis will be stratified by incontinence severity measured by a 1-h pad test at the baseline. In comparison among the groups, changes in the amount of urine leakage at week 6 from the baseline will be analyzed by ANCOVA or nonparametric tests. Changes in the 72-h IEF at weeks 18 and 30 will be analyzed by covariance analysis, non-parametric tests, or longitudinal data model.