Table 1_Adherence to the Canadian 24-hour movement guidelines and vision impairment in children and adolescents: a cross-sectional study.docx

ObjectivesTo investigate the associations between adherence to the Canadian 24-hour movement guidelines—covering physical activity (PA), screen time (ST), and sleep duration (SD)—and vision impairment, specifically myopia and myopic anisometropia, among children and adolescents in Shenzhen, China.
MethodsA cross-sectional study was conducted in 2022 with 4,649 participants. Adherence to the guidelines was assessed using self-reported PA, ST, and SD measures, while vision impairment was clinically evaluated. Logistic regression models were used to analyze the associations, adjusting for sociodemographic factors.
ResultsAmong the participants, 48.63% were diagnosed with myopia and 11.01% had myopic anisometropia. Meeting the ST guideline was associated with a reduced risk of myopia (aOR = 0.86, 95% CI = 0.76-0.98) and myopic anisometropia (aOR = 0.78, 95% CI = 0.64-0.95). Meeting both PA and ST guidelines further reduced the odds of myopia (aOR = 0.73, 95% CI = 0.56-0.97) and myopic anisometropia (aOR = 0.60, 95% CI = 0.41-0.89). Meeting all three guidelines (PA, ST, and SD) significantly reduced the odds of myopia (aOR = 0.71, 95% CI: 0.53–0.93) and showed a trend toward reduced risk of anisometropia (aOR = 0.69, 95% CI: 0.47–1.02), compared to those who met none. Meeting two guidelines also significantly reduced the risk of myopia (aOR = 0.76, 95% CI: 0.59–0.97) and anisometropia (aOR = 0.71, 95% CI: 0.51–1.00).
ConclusionAdherence to the 24-hour movement guidelines, particularly meeting the ST and PA recommendations, was associated with a lower risk of myopia and myopic anisometropia. These findings highlight the importance of promoting balanced lifestyle behaviors, such as limiting screen time and encouraging physical activity, to mitigate vision impairment among children and adolescents.

研究目的：旨在探究中国深圳地区儿童青少年遵守加拿大24小时运动指南（涵盖身体活动（physical activity, PA）、屏幕时间（screen time, ST）与睡眠时长（sleep duration, SD））与视力损害（特别是近视（myopia）及近视性屈光参差（myopic anisometropia））之间的关联。
研究方法：本研究于2022年开展横断面研究，共纳入4649名受试者。受试者对指南的依从性通过自我报告的身体活动、屏幕时间与睡眠时长情况进行评估，视力损害则经临床检查予以确诊。采用逻辑回归模型分析二者的关联，并对社会人口学特征因素进行校正。
研究结果：纳入的受试者中，48.63%被诊断为近视，11.01%存在近视性屈光参差。符合屏幕时间指南与近视风险降低相关（校正后比值比aOR=0.86，95%置信区间CI=0.76-0.98），同时与近视性屈光参差风险降低相关（aOR=0.78，95%CI=0.64-0.95）。同时满足身体活动与屏幕时间指南要求的受试者，其近视（aOR=0.73，95%CI=0.56-0.97）与近视性屈光参差（aOR=0.60，95%CI=0.41-0.89）的发生风险进一步降低。与未满足任何一项指南要求的受试者相比，同时满足三项指南（身体活动、屏幕时间与睡眠时长）要求的受试者近视发生风险显著降低（aOR=0.71，95%CI=0.53–0.93），且近视性屈光参差风险呈降低趋势（aOR=0.69，95%CI=0.47–1.02）。满足两项指南要求的受试者，其近视（aOR=0.76，95%CI=0.59–0.97）与近视性屈光参差（aOR=0.71，95%CI=0.51–1.00）风险均显著降低。
研究结论：遵守24小时运动指南，尤其是符合屏幕时间与身体活动的推荐要求，与儿童青少年近视及近视性屈光参差的发病风险降低显著相关。本研究结果凸显了推广均衡生活方式行为的重要性，例如限制屏幕使用时间、鼓励身体活动，以减轻该地区儿童青少年的视力损害负担。