General Practice
Evaluation of the effectiveness of an educational intervention for general practitioners in adolescent health care: randomised controlled trialCommentary: Applying the BMJ's guidelines on educational interventions
BMJ 2000; 320 doi: https://doi.org/10.1136/bmj.320.7229.224 (Published 22 January 2000) Cite this as: BMJ 2000;320:224
Data supplement
- Sample size
Sample size estimation was based on the minimum desirable change in knowledge score. To detect an effect size difference of 0.67 in a simple random sample with a power of 80% and significance level of 95%, 74 subjects were required. This figure was inflated to 148 to allow for randomisation by cluster (rho = 0.05) and 20% attrition.
Flow of participants
