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Table 4 Sample size estimation (statistical power: 80% power, at the 5% significance level).

From: Protocol for the Quick Clinical study: a randomised controlled trial to assess the impact of an online evidence retrieval system on decision-making in general practice

Condition Annual rate of medication use per 100 problem-specific encounter Sample size (no. of GPs required in each arm)
Asthma- use of preventers 53.2 54
Asthma- SA Bronchodilators 53.1 54
Depression- SSRI 41.7 85