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Table 1 Sample size calculation

From: Study protocol of an equivalence randomized controlled trial to evaluate the effectiveness of three different approaches to collecting Patient Reported Outcome Measures (PROMs) data using the Prostate Cancer Outcomes Registry-Victoria (PCOR-VIC)

Indicator Targeted response rate Equivalence margin Sample size (SS) per group Internet access SS adjusted for email Total Sample required
Response rate 90% 10% 190 83% 229 687