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Table 1 Power analysis for Chi-square test: alpha = 0.05

From: Modified paramedian versus conventional paramedian technique in the residency training: an observational study

  End point p1 for C p2 for M Effect size Achieved power
Spinal group Success (attempt = 1) 20.31% 59.38% 0.97 1.000
N = 128 per each Failure 7.81% 1.56% 0.23 0.920
  Complication 1.56% 1.56% NA NA
Epidural group Success (attempt = 1) 14.29% 64.94% 1.45 1.000
N = 77 per each Failure 15.58% 2.60% 0.36 0.965
  Complication 14.29% 1.30% 0.37 0.972
Combined group Success (attempt = 1) 15.09% 47.27% 0.90 1.000
N = 53/55 Failure 22.64% 1.82% 0.50 0.987
  Complication 20.75% 3.64% 0.42 0.963