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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