Table 2.
Risks of life-style variables for PARI among university students in China
| Characteristics | All (n=4758), median (IQR) |
Non-PARI (n=3677), median (IQR) |
PARI (n=1081), median (IQR) |
Adjusted OR |
95% CI |
| Domestic/work/study | |||||
| VPA | |||||
| Frequency, day/week | 0 (0, 1) | 0 (0, 1) | 0 (0, 2) | 1.168*** | 1.111 to 1.228 |
| Duration, min/day | 0 (0, 20) | 0 (0, 15) | 0 (0, 30) | 1.008*** | 1.006 to 1.010 |
| Volume, min/week | 0 (0, 30) | 0 (0, 20) | 0 (0, 60) | 1.002*** | 1.001 to 1.002 |
| MPA | |||||
| Frequency, day/week | 1 (0, 2) | 1 (0, 2) | 1 (0, 3) | 1.124*** | 1.082 to 1.167 |
| Duration, min/day | 10 (0, 30) | 10 (0, 30) | 20 (0, 30) | 1.005*** | 1.004 to 1.007 |
| Volume, min/week | 20 (0, 60) | 10 (0, 60) | 40 (0, 100) | 1.001*** | 1.001 to 1.002 |
| MVPA | |||||
| Volume, min/week | 40 (0, 120) | 30 (0, 105) | 60 (0, 180) | 1.001*** | 1.001 to 1.002 |
| Transportation | |||||
| MPA | |||||
| Frequency, day/week | 5 (1, 7) | 5 (1, 7) | 5 (2, 7) | 1.030* | 1.003 to 1.059 |
| Duration, min/day | 30 (10, 40) | 30 (10, 40) | 30 (15, 50) | 1.002** | 1.001 to 1.004 |
| Volume, min/week | 120 (30, 210) | 105 (30, 210) | 140 (50, 210) | 1.002*** | 1.001 to 1.003 |
| Sports and leisure time | |||||
| VPA | |||||
| Frequency, day/week | 0 (0, 1) | 0 (0, 1) | 0 (0, 2) | 1.171*** | 1.116 to 1.229 |
| Duration, min/day | 0 (0, 30) | 0 (0, 30) | 0 (0, 47.5) | 1.008*** | 1.006 to 1.011 |
| Volume, min/week | 0 (0, 60) | 0 (0, 38) | 0 (0, 90) | 1.002*** | 1.001 to 1.003 |
| MPA | |||||
| Frequency, day/week | 1 (0, 2) | 0 (0, 2) | 1 (0, 3) | 1.125*** | 1.082 to 1.169 |
| Duration, min/day | 10 (0, 30) | 0 (0, 30) | 20 (0, 40) | 1.006*** | 1.004 to 1.008 |
| Volume, min/week | 15 (0, 80) | 0 (0, 75) | 40 (0, 90) | 1.002*** | 1.001 to 1.002 |
| MVPA | |||||
| Volume, min/week | 45 (0, 130.5) | 30 (0, 120) | 80 (0, 210) | 1.001*** | 1.001 to 1.002 |
| Total VPA | |||||
| Volume, min/week | 0 (0, 100) | 0 (0, 80) | 40 (0, 180) | 1.001*** | 1.001 to 1.002 |
| Total MPA | |||||
| Volume, min/week | 60 (0, 150) | 60 (0, 140) | 100 (10, 200) | 1.001*** | 1.001 to 1.001 |
| Total MVPA | |||||
| Volume, min/week | 255 (120, 490) | 235 (105, 450) | 340 (180, 630) | 1.001*** | 1.000 to 1.001 |
| n (%) | n (%) | n (%) | |||
| Sedentary behaviours | |||||
| <4.00 hours/day | 590 (12.4) | 459 (77.8) | 131 (22.2) | 1 (ref.) | |
| 4.00–5.99 hours/day | 869 (18.3) | 664 (76.4) | 205 (23.6) | 1.119 | 0.859 to 1.459 |
| 6.00–8.99 hours/day | 1453 (30.5) | 1119 (77.0) | 334 (23.0) | 0.983 | 0.769 to 1.258 |
| 9.00–11.99 hours/day | 978 (20.6) | 752 (76.9) | 226 (23.1) | 0.940 | 0.721 to 1.225 |
| ≥12.00 hours/day | 868 (18.2) | 683 (78.7) | 185 (21.3) | 0.795 | 0.604 to 1.045 |
| Sleep duration | |||||
| 7.00–7.99 hours/day | 1882 (39.6) | 1493 (79.3) | 389 (20.7) | 1 (ref.) | |
| <6.00 hours/day | 287 (6.0) | 223 (77.7) | 64 (22.7) | 1.428* | 1.032 to 1.977 |
| 6.00–6.99 hours/day | 969 (20.4) | 708 (73.0) | 261 (27.0) | 1.425*** | 1.175 to 1.729 |
| 8.00–8.99 hours/day | 1186 (24.9) | 916 (77.2) | 270 (22.8) | 1.131 | 0.939 to 1.361 |
| ≥9.00 hours/day | 434 (9.1) | 337 (77.6) | 97 (22.4) | 1.020 | 0.782 to 1.331 |
Adjusted ORs and 95% CIs of each life style variable were calculated after controlling for the significant sociodemographic variables in table 1, including city, study year, gender, university/other sports team member and any chronic disease/symptom.
*P<0.05, **P<0.01, ***P<0.001.
MPA, moderate-intensity physical activity; MVPA, moderate and vigorous-intensity physical activity; PARI, physical activity-related injury; VPA, vigorous-intensity physical activity.