Cluster Randomized Controlled Trial Sample Size. Assuming an average cluster size required sample sizes are readily computed for both binary and continuous outcomes by estimating a design effect or inflation factor. Breathlessness management techniques used by paramedics may reduce the need for conveyance to hospital.
Sample size per arm 480 Number clusters per arm16. The advantages of cRCTs include preventing treatment contamination enhancing administrative efficiency convenience external validity ethical considerations and likelihood of increased compliance by participants. This increased the sample size to 1104 patients with 24 practices recruiting 46 patients.
The one cluster randomized trial allocating worksites included approximately 42 of the 6893 participants.
A total of 673 professional participants were enrolled and randomly allocated to one of two groups namely 341 participants in 10 workshops to control group and 332 participants in 9 workshops to. A total of 673 professional participants were enrolled and randomly allocated to one of two groups namely 341 participants in 10 workshops to control group and 332 participants in 9 workshops to. We calculated the sample size using the formula proposed by Hayes. To account for clustering effects from randomised practices an intracluster correlation coefficient of 005 was applied.
