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Table 1 Sample size estimation for practice level analysis

From: A cluster randomised stepped wedge trial to evaluate the effectiveness of a multifaceted information technology-based intervention in reducing high-risk prescribing of non-steroidal anti-inflammatory drugs and antiplatelets in primary medical care: The DQIP study protocol

Standard Deviation Difference 10% to 8% Effect size Number of practices
4.0% 2.0% 0.500 34
6.0% 2.0% 0.333 73
7.0% 2.0% 0.286 96