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Table 2 Study sample size calculated using the EPIDAT program

From: The effectiveness of a digital shared decision-making tool in hormonal contraception during clinical assessment: study protocol of a randomized controlled trial in Spain

Power (%) Sample size* (+ correction factor for expected losses)
  EG CG Total
80.0 854 854 1708
  1. Sample sizes to apply the χ2 test with Yates continuity correction
  2. *An α risk of 0.05 and a β risk of 0.2 (80% power) are assumed, standard values in such studies