Baseline characteristics of participants with valid accelerometer data at baseline and follow-up (N = 854).
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SD, standard deviation; SES, socioeconomic status.Wear time at follow-up (mean ± SD) min/d: After-school All = 320.6±57.0, Girls = 321.4±56.4, Boys = 319.4±57.8; Weekend All = 683.7±82.1, Girls = 679.9±77.7, Boys = 688.9±87.6.aAfter-school defined as 3–11pm Monday to Friday.
创建时间：
2015-12-02
