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Table 2 Sample size estimation

From: Double-chamber syringe versus classic syringes for peripheral intravenous drug administration and catheter flushing: a study protocol for a randomised controlled trial

Input Output 
Tail(s)OneSample size group 173
Proportion p10.19Sample size group 273
Proportion p20.05Total sample size146
α err prob0.05Actual α0.0197
Power (1-β err prob)0.80  
Allocation ratio N2/N11  
  1. Fisher’s exact test: Proportions, inequality, two independent groups