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Table 1 Power (probability of detecting a true effect %) under a range of baseline proportions of parental awareness of the health risk of their child’s weight using a matched case–control design with a two sided alpha of 5% (calculations carried out using the sampsi_mcc command in STATA v10)

From: Scoping the impact of the national child measurement programme feedback on the child obesity pathway: study protocol

Sample size Effect size Power (if 30% recognise health risk at baseline) Power (if 10% recognise health risk at baseline)
200 5% 28 58
400 5% 50 91
800 5% 80 100