School-level intraclass correlation for physical activity in sixth grade girls.

@article{Murray2006SchoollevelIC,
  title={School-level intraclass correlation for physical activity in sixth grade girls.},
  author={David M Murray and June Stevens and P. J. Hannan and Diane J. Catellier and Kathryn H. Schmitz and Marsha Dowda and Terry L. Conway and Janet C. Rice and Song Yang},
  journal={Medicine and science in sports and exercise},
  year={2006},
  volume={38 5},
  pages={926-36}
}
PURPOSE The Trial for Activity in Adolescent Girls (TAAG) is a group-randomized trial (GRT) to reduce the usual decline in moderate to vigorous physical activity (MVPA) among middle school girls. We report the school-level intraclass correlation (ICC) for MVPA from the TAAG baseline survey of sixth grade girls and describe the relationship between the schedule of data collection and the ICC. METHODS Each of six sites recruited six schools and randomly selected 60 sixth grade girls from each… CONTINUE READING

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