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Table 4 Power calculations for the Counselling for Alcohol Problems trial on available sample sizes for sub-group analyses

From: The effectiveness and cost-effectiveness of lay counsellor-delivered psychological treatments for harmful and dependent drinking and moderate to severe depression in primary care in India: PREMIUM study protocol for randomized controlled trials

Sub-group

Outcome

Sample size

Power

Effect size

Harmful drinking and alcohol dependence

Mean standard ethanol content consumed in past two weeks

638

0.50

99%

   

0.40

92%

   

0.33

80%

   

0.40

63%

   

0.33

48%

Alcohol dependence

Mean standard ethanol content consumed in past two weeks

238

0.50

86%

   

0.40

69%