[Perceived exercise benefits and barriers and their association with physical activity time in Chinese Han children and adolescents aged 9 to 18 years].

Objective: To analyze the perceived exercise benefits and barriers and their association with physical activity time in Chinese Han children and adolescents aged 9-18 years. Methods: Data were extracted from the 2019 Chinese National Survey on Students' Constitution and Health and a total of 163 656 children and adolescents aged 9-18 years in Han ethnic group were included in the analysis. Mann-Whitney U test and Kruskal-Wallis test were used to compare the perceived exercise benefits score, perceived exercise barriers score and perceived exercise benefits to barriers ratio in the children and adolescents with different demographic characteristics and physical activity time. The differences in physical activity time in subgroups were compared with χ2 tests. log-binomial regression model was used to evaluate the association between physical activity time and perceived exercise benefits and barriers. Results: The M (Q1,Q3) of the perceived exercise benefits score, perceived exercise barriers score, and perceived exercise benefits to barriers ratio in the children and adolescents were 4.11 (3.78, 4.78), 2.70 (2.10, 3.20) and 1.55 (1.22, 2.07), respectively. Children and adolescents living in urban area, boys, those at younger age and those with physical activity time ≥1 hour had higher perceived exercise benefits score and perceived exercise benefits to barriers ratio, but lower perceived exercise barriers score (all P<0.001). The prevalence of physical activity time ≥1 hour was 41.4% in the children and adolescents. In the log-binomial model with two variables of perceived exercise benefits score and perceived exercise barriers score, for each 1-point increase in the perceived exercise benefits, the possibility of physical activity time ≥1 hour increased by 11% (OR=1.11, 95%CI: 1.10-1.12), and for each 1-point increase in the perceived exercise barriers, the possibility of physical activity time ≥1 hour decreased by 15% (OR=0.85, 95%CI: 0.84-0.85). In the log-binomial model with variable of perceived exercise benefits to barriers ratio, for each 1-point increase in the perceived exercise benefits to barriers ratio, the possibility of physical activity time ≥1 hour increased by 12% (OR=1.12, 95%CI: 1.11-1.12). Conclusion: The perceived exercise benefits and barriers are significantly associated with physical activity time in children and adolescents in China.目的： 描述2019年中国9~18岁汉族儿童青少年感知运动益处与障碍的现况，并分析其与校内体育活动时间的关系。 方法： 利用2019年全国学生体质与健康调研数据，选取163 656名9~18岁汉族儿童青少年作为研究对象，使用Mann-Whitney U检验和Kruskal-Wallis检验比较不同人口学特征和体育活动时间儿童青少年感知运动益处得分、感知运动障碍得分和感知运动益处与障碍比值的差异，采用χ2检验比较儿童青少年校内体育活动时间的差异。建立log-binomial回归模型，在调整个人、家庭和学校等校内体育活动时间影响因素后，分别分析儿童青少年校内体育活动时间与其感知运动益处得分和感知运动障碍得分，以及感知运动益处与障碍比值之间的关系。 结果： 儿童青少年参与身体活动的感知运动益处得分、感知运动障碍得分和感知运动益处与障碍比值的M（Q1，Q3）分别为4.11（3.78，4.78）、2.70（2.10，3.20）和1.55（1.22，2.07），其中，城市儿童青少年、男生、年龄较小和校内体育活动时间≥1 h的儿童青少年感知运动益处得分和感知运动益处与障碍比值更高，且感知运动障碍得分更低（均P<0.001）。儿童青少年校内体育活动时间≥1 h的报告率为41.4%。log-binomial回归分析结果显示，当模型中纳入感知运动益处得分与感知运动障碍得分这两个变量时，感知运动益处得分每增加1分，校内体育活动时间≥1 h的可能性提高11%（OR=1.11，95%CI：1.10~1.12），感知运动障碍得分每增加1分，校内体育活动时间≥1 h的可能性降低15%（OR=0.85，95%CI：0.84~0.85）；当模型中纳入感知运动益处与障碍比值这一变量时，感知运动益处与障碍比值每增加1，校内体育活动时间≥1 h的可能性增加12%（OR=1.12，95%CI：1.11~1.12）。 结论： 儿童青少年的感知运动益处与障碍水平与其校内体育活动时间显著相关。.