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Table 5 Undisplaced fractures: estimated study power for 250 patients per treatment arm (N = 500)

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%

20%

8.0%

13.2%

20.6%

30.3%

42.0%

68.0%

25%

9.3%

16.0%

25.5%

37.8%

51.3%

79.0%

30%

10.7%

19.1%

31.0%

45.6%

61.4%

87.1%

35%

12.3%

22.6%

36.3%

53.7%

70.3%

92.7%

40%

14.1%

26.5%

43.3%

61.8%

78.2%

96.3%

  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.
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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