Other information was collected using an online standardized questionnaire. The academic performance was recorded and provided by the participating schools and further standardized. Outdoor time was recorded by self-developed algorithm-validated wristwatches in real-time and calculated as the cumulative average of 10 months. Data were derived from a school-based prospective children myopia intervention study (STORM). This study was designed as a cross-sectional study. To explore the relationship between outdoor time and academic performance among school-aged children.
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