[Comparison of status of physical activity time at school and influencing factors in students in China, 2010 and 2014].

To compare the probability of physical activity (PA) time ≥1 hour at school and influencing factors in students in China between 2010 and 2014. We used the data of 2010 and 2014 Chinese National Survey on Students' Constitution and Health (CNSSCH). The surveys covered the Han students aged 9-22 years and Tibetan students aged 9-18 years (Tibet). The participants were primary school students (9-12 years old), junior high school students (13-15 years old), senior high school students (16-18 years old) and college students (19-22 years old). The probability of PA time ≥1 hour at school was compared using (2) tests between 2010 and 2014 survey years. Log-binomial Regression was used to estimate the relative risk () for the probability of PA time ≥1 hour at school in different age groups. The overall probability of PA time ≥1 hour at school in students aged 9-22 years was 20.5 in 2010, and 23.8 in 2014. The difference between 2010 and 2014 was significant (<0.001). On the whole, the probability of PA time ≥1 hour at school increased in the eastern, central and western areas in 2014 compared with 2010 (<0.05), and the increase range was highest in eastern area, followed by western area and central area (<0.05). The probability of PA time of 1 hour at school in all age groups increased in 2014 compared with 2010 (<0.05). The increase in the probability of PA time ≥1 hour at school was larger in primary school students than that in high school students and college students (<0.05). The probability of PA time ≥1 hour at school increased in all age groups in three areas, except in junior and senior high school students in the central area where the probability of PA time ≥1 hour at school decreased. The probability of PA time ≥1 hour at school in primary and junior/senior high school students in the eastern area had the greatest increase, but in college students it had the smallest increase in the three areas. From 2010 to 2014, the changes in the probability of PA time ≥1 hour at school in students in different provinces were quite different, especially in primary school students. The probability of PA time ≥1 hour at school in four age groups increased in only three provinces. With the probability of PA time ≥1 hour at school in primary school students as the reference, the in junior high students had no significant change between 2010 and 2014. The in senior high school increased from 0.34 (0.33-0.35) in 2010 to 0.36 (0.36-0.37) in 2014, and the in college students increased from 0.33 (0.32-0.34) in 2010 to 0.43 (0.42-0.44) in 2014. The probability of PA time ≥1 hour at school in all age groups increased in 2014 compared with 2010, but there were great differences among provinces. The findings of our study suggests that although the national policy played a certain role, the provinces should take specific measures to improve the probability of PA time ≥1 hour at school in students according to their own conditions. In addition, more attention should be paid to PA of older students.