Clinical Drug Experience Knowledgebase

The Effect of Urox™(Crateva, Horsetail and Lindera Combination) in the Treatment of Overactive Bladder and Urinary Incontinence

Initial consultations were held at either the Brisbane campus of the Endeavour College of Natural Medicine Naturopathic clinic or at Kelvin Grove Natural Medicine clinic, Brisbane. Follow up interviews are being conducted via telephone. To minimize dropout rates, participants are telephoned (as a reminder for the call and to complete the micturition diaries) approximately 1 week before the scheduled interview time and were intermittently called over the week following if they were unable to be reached at the scheduled interview time. Three attending clinicians interviewed trial participants, all having participated in interview training prior to any interviews being taken. The training was designed to ensure utility of a uniform and consistent approach regarding how questions were asked and how data was recorded.

The week prior to an initial consultation participants were requested to complete a micturition diary and health related quality of life surveys, to serve as baseline measures. The attending clinician then also completed a clinical data sheet, at the time of the initial consultation, containing a range of questions including demographics, exercise, health history and habits, which will be used to control and correlate data variables. Any incomplete quality of life surveys at the outset were also completed at the first interview.

Micturition diaries are collected by post at 2, 4 and 8 week intervals along with the completion of quality of life surveys and follow up clinical data sheet via telephone. Participants were asked to keep the micturition diary for 3 days prior to each consultation and were provided reply paid envelopes to return the surveys and unused capsules to assess compliance.

For the primary outcome (day frequency) measure it was calculated that 90 participants equally divided into placebo and control were required to detect a difference of 1.6 urinary frequency episodes per day (2.7SD) between treatment and placebo groups, with a two-tailed alpha of 0.05 and a power of 80%. For total incontinence, 53 participants were required equally divided into each group to detect a difference of 1.2 episodes per day (2.2SD), while for urgency 54 was required in each group to detect a difference of 2 per day (3.7SD). To account for potential drop-outs and variations in presenting symptoms, a total of 150 participants were recruited.

Data for the two treatments will be compared using mixed effects ordered logistic regression adjusted for repeated measures (Stata, version 13.1, StataCorp, TX, USA). GraphPad Prism (version 6.00 for Windows, GraphPad Software, La Jolla California, USA) will be used to plot the data. Data (day frequency, night frequency, urgency and incontinence) will be evaluated by intention to treat analysis, with the last result brought forward for people who dropped out or were lost to follow-up. Variables selected for adjustment using backward stepwise regression from list including age, sex, water intake and diuretic use (p<0.22 for covariate inclusion). Holm estimation test will be used to adjust p-values for repeated measures. Each analysis will only included participants who are symptomatic at baseline. For example, in relation to daytime urinary frequency - only participants with baseline of ≥10 will be included in the analyses.