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Table 1 Power calculations for sample of 120

From: The Leeds Evaluation of Efficacy of Detoxification Study (LEEDS) project: An open-label pragmatic randomised control trial comparing the efficacy of differing therapeutic agents for primary care detoxification from either street heroin or methadone [ISRCTN07752728]

Difference between groups

Power

70% × 60%

21%

70% × 50%

61%

70% × 45%

80%

70% × 40%

92%

60% × 50%

20%

60% × 40%

59%

60% × 35%

79%

60% × 30%

92%

50% × 40%

20%

50% × 30%

61%

50% × 25%

82%

40% × 30%

21%

40% × 20%

67%

40% × 15%

88%

30% × 20%

24%

30% × 15%

50%

30% × 10%

79%

20% × 15%

11%

20% × 10%

33%

20% × 5%

70%