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Table 2 Sample size estimation for patient level analysis with time series data

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

Number of practices Effect size Power
10 0.25 83%
10 0.50 97%
10 0.75 99%
10 > 1.0 > 99%