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Table 1 Study power calculations at various assumptions

From: Bladder pain syndrome: validation of simple tests for diagnosis in women with chronic pelvic pain: BRaVADO study protocol

    Sample size
Sensitivity Sensitivity to exclude No. of patients with BPS Total number of patients
40% prevalence 50% prevalence 60% prevalence
60% 45% 82 205 164 137
65% 50% 78 195 156 130
70% 55% 76 190 152 127
75% 60% 73 183 146 122
80% 65% 69 173 132 115