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Table 1 Calculations for the sample size

From: Evaluating the efficacy of dexamethasone in the treatment of patients with persistent acute respiratory distress syndrome: study protocol for a randomized controlled trial

  VFDs   Probability of getting off ventilation alive Probability of death Probability of receiving ventilation Expected mortality
  Mean SD pa pd po 60-day mortality
Control group 9.0 10.7 0.0481 0.0500 0.9019 0.4814
Experimental group 12.0 10.8 0.0641 0.0345 0.9014 0.3308
Difference 3.0   0.0160 -0.0155 -0.0005 -0.1506
  1. VFD ventilator-free days, SD standard deviation