[Analysis on prevalence of physical activity time <1 hour and related factors in students aged 9-22 years in China, 2014].

To explore the prevalence of physical activity time <1 hour and related factors in students aged 9-22 years in China. A total of 220 159 students (110 039 boys and 110 120 girls) aged 9-22 years who completed the questionnaire of physical activity and lifestyle behaviors were selected from " 2014 National Physical Fitness and Health Surveillance" for the current study. All the participants were divided into 2 groups, i.e. physical activity time <1 hour and physical activity time ≥1 hour according the suggestion of Central Government, stratified by age and gender. (2) tests were used to compare the difference in the prevalence of physical activity time <1 hour between boys and girls in every age groups. Univariate and multivariate log-binomial regression models were used to explore the factors that influenced the prevalence of physical activity time <1 hour. The boy's prevalence of physical activity time <1 hour was 73.3%, with the lowest (57.0%) in 9-years-old group, and highest (82.5%) in 18 years old group. The girl's prevalence of physical activity time <1 hour was 79.1%, with the lowest (60.1%) in 9-years-old group, and highest (89.8%) in 21 years old group. Overall, The prevalence of physical activity time <1 hour was significantly higher in girls than in boys (<0.001), and the prevalence were significantly higher in girls than in boys in all the age groups (<0.001), and it was observed that the prevalence of physical activity <1 hour increased with age in both boys and girls (<0.001). Multivariate log-binomial regression model found that being girl (=1.05, 95: 1.05-1.06), parents' disliking children to participate physical activity (=1.08, 95: 1.07-1.09), heavy homework (=1.13, 95: 1.12-1.14), long homework time ( =1.08, 95: 1.07-1.08), long time spending on electronic screen watching (=1.01, 95: 1.00-1.01) and disliking physical class (=1.11, 95: 1.10-1.12) could be the risk factors for physical activity time <1 hour, however, living in rural area (=0.99, 95: 0.98-0.99) and no supporting from parents for children to participate physical activity (=0.99, 95: 1.98-1.00) could be the protective factors, but no consistent association with the time of TV watching was observed (=0.226). The prevalence of physical activity time <1 hour was high in students aged 9-22 years in China. Female, parents; disliking children to participate physical activity, heavy homework, long homework time, long electronic screen watching time and disliking physical class might be the risk factors.