The Impact of Playworks on Students' Physical Activity by Race/Ethnicity: Findings from a Randomized Controlled Trial.

Background: The Playworks program places coaches in low-income urban schools to engage students in physical activity during recess. The purpose of this study was to estimate the impact of Playworks on students' physical activity separately for Hispanic, non-Hispanic black, and non-Hispanic white students.

Methods: Twenty-seven schools from 6 cities were randomly assigned to treatment and control groups.

Disentangling the Linkage of Primary Care Features to Patient Outcomes: A Review of Current Literature, Data Sources, and Measurement Needs.

Primary care plays a central role in the provision of health care, and is an organizing feature for health care delivery systems in most Western industrialized democracies. For a variety of reasons, however, the practice of primary care has been in decline in the U.S.