Fig. 1From: Defining competency in flexible cystoscopy: a novel approach using cumulative Sum analysisCumulative Sum (CUSUM) score for atraumatic passage of cystoscope via urethra (n = 409). Acceptable failure rate at 0.01 and unacceptable failure rate 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). Filled arrow identifies when competence is achievedBack to article page