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Table 2 Power for effect size given fixed sample size

From: Impact of nationwide enhanced implementation of best practices in pancreatic cancer care (PACAP-1): a multicenter stepped-wedge cluster randomized controlled trial

PopulationNp0p1RDICCPowerInterpretation
25-month study duration (including 5.8-week wash-in period)
 DPCG21420.650.550− 0.1000.01840.880% power for true reduction of 10.0%
 DPCG21420.650.535− 0.1150.01840.990% power for true reduction of 11.5%
 All NL47690.780.714− 0.0660.03680.880% power for true reduction of 6.6%
 All NL47690.780.704− 0.0760.03680.990% power for true reduction of 7.6%
 All NL47690.780.722− 0.0580.00920.880% power for true reduction of 5.8%
 All NL47690.780.712− 0.0680.00920.990% power for true reduction of 6.8%
  1. N sample size, p0 current 1-year mortality, p1 expected 1-year mortality, RD risk difference, ICC intra-cluster correlation coefficient, CAC cluster autocorrelation, DPCG Dutch Pancreatic Cancer Group, NL the Netherlands