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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