Children and adolescents in the United States are increasingly overweight at younger ages. Many studies have investigated the issue from the perspective of professionals and other adults. This study assessed early adolescents' perceptions regarding the magnitude of, effects of, causes of, solutions for, and learning preferences related to…

This paper examines how controlling statistically for baseline covariates (especially pretests) improves the precision of studies that randomize schools to measure the impacts of educational interventions on student achievement. Part I of the paper introduces the concepts, issues, and options involved. Parts II and III present empirical findings…