Objective: To determine whether periodic supportive supervision after a training course improved the quality of paediatric hospital care in Kyrgyzstan, where inappropriate care was common but in-hospital postnatal mortality was low. Methods: In a cluster, randomized, parallel-group trial, 10...

Objective: To determine whether periodic supportive supervision after a training course improved the quality of paediatric hospital care in Kyrgyzstan, where inappropriate care was common but in-hospital postnatal mortality was low. Methods: In a cluster, randomized, parallel-group trial, 10...

This article presents findings from the largest experimental evaluation to date of school-based mandatory-random student drug testing (MRSDT) and its effectiveness in reducing substance use among high school students. The study found that students who were subject to MRSDT reported less...

This article presents findings from the largest experimental evaluation to date of school-based mandatory-random student drug testing (MRSDT) and its effectiveness in reducing substance use among high school students. The study found that students who were subject to MRSDT reported less...

The precision of estimates of treatment effects in multilevel experiments depends on the sample sizes chosen at each level. It is often desirable to choose sample sizes at each level to obtain the smallest variance for a fixed total cost, that is, to obtain optimal sample allocation. This...