Two parallel, pragmatic, UK multicentre, randomised controlled trials comparing surgical options for upper compartment (vault or uterine) pelvic organ prolapse (the VUE Study): study protocol for a randomised controlled trial

Table 1 Recruitment numbers expected

	Uterine Trial N = 630	Vault Trial N = 280
Women needed per arm (minimum)	268	140
Allowing for 15 % dropout	315	119
Total number of women	630	280
Assuming 50 % willing to enter RCT, number of women having prolapse surgery needed	1260	560
Number of operations per year per typical centre	18	5
Number of typical centres needed for approx 39 months	35	34
Allowing for a staggered start	40	40

ISSN: 1745-6215