Kappa statistics for validity ranged from −0.14 to 1.00 (IQR 0.44). Percent agreement for reliability ranged from 34.78 to 100.00 (IQR 21.7). Results: Test/retest reliability of the questionnaire yielded kappa statistics that ranged from −0.14 to 1.00 (interquartile range 0.36). A weighted kappa test statistic and percent agreement were calculated for each question and specific groups of questions (questionnaire section, item topic, and response type). To assess convergent validity, school responses were compared with the responses completed by the research team ( n = 28). Methods: Reliability was measured by comparing data collected by school personnel from low-income elementary schools across California at two time points, an average of 2 months apart ( n = 23). Although school health environment assessments exist for planning purposes, we developed and tested a comprehensive questionnaire that is suitable for both evaluation and planning. Background: Schools are an ideal setting for policy, systems, and environmental approaches to obesity prevention.
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