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Table 4 Displaced fractures: estimated study power for 500 patients per treatment arm (N = 1,000)

From: Fixation using alternative implants for the treatment of hip fractures (FAITH): design and rationale for a multi-centre randomized trial comparing sliding hip screws and cancellous screws on revision surgery rates and quality of life in the treatment of femoral neck fractures

Baseline risk

(Year 1)^

Relative risk reduction

 

10%

15%

20%

25%

30%

40%x

20%

12.0%

22.1%

36.3%

53.2%

70.1%

93.0%

25%

14.5%

27.6%

45.3%

64.5%

81.0%

97.5%

30%

17.2%

33.5%

45.3%

74.4%

88.9%

99.2%

35%

20.3%

40.0%

63.2%

82.7%

94.1%

99.8%

40%

23.8%

47.0%

71.7%

89.2%

97.2%

100.0%

  1. *Number of patients per treatment arm, alpha = 0.05.
  2. ^Year 2 risk is 1/3 that of year 1.
  3. Bold numbers indicate statistical power range for this study.