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Simulation studies show that the derived formulas provide accurate estimates for the required sample size across different settings. As illustration, real data from two clinical studies of hepatic and cardiovascular diseases are used as pilot data to calculate sample sizes for future trials. This study aimed to explore the frequency of both serious and minor cyberloafing behaviours of nurses and the factors which affect these behaviours. Cyberloafing is using the internet or an internet connected device at work for personal use. Cyberlo