Fig. 4From: Defining competency in flexible cystoscopy: a novel approach using cumulative Sum analysisCumulative Sum (CUSUM) for examination of the bladder neck (n = 383). Acceptable failure rate set at 0.01 and unacceptable failure rate set at 0.03. Type I and II error rate 0.1. Each horizontal line on the y-axis represents a control line (h = 1.96)Back to article page