Table 3.

Final model of hierarchical logistic regression to estimate risks of both sociodemographic and life-style variables for PARI among university students in China

Characteristics	P value	Adjusted OR	95% CI
Block 1
City
Jinan		1 (ref.)
Shantou	0.000	4.239	3.475 to 5.171
Hong Kong	0.468	0.913	0.713 to 1.168
Study year
Year 1	0.039	1.287	1.099 to 1.515
Year 2	0. 883	1.014	0.846 to 1.215
Year 3		1 (ref.)
Gender
Male	0.028	1.199	1.020 to 1.410
Female		1 (ref.)
University sports team member
No		1 (ref.)
Yes	0.000	2.360	1.881 to 2.961
Other sports team member
No		1 (ref.)
Yes	0.000	1.717	1.309 to 2.253
Any chronic disease/symptom
No		1 (ref.)
Yes	0.013	1.548	1.096 to 2.187
Block 2
Sports and leisure-time VPA, frequency (day/week)	0.010	1.079	1.018 to 1.144
Sports and leisure-time VPA, duration (min/day)	0.000	1.006	1.003 to 1.008
Sports and leisure-time MPA, duration (min/day)	0.000	1.004	1.002 to 1.006
Sleep duration
7.00–7.99 hours/day		1 (ref.)
<6.00 hours/day	0.045	1.333	1.006 to 1.766
6.00–6.99 hours/day	0.014	1.262	1.048 to 1.519
8.00–8.99 hours/day	0.314	1.111	0.905 to 1.365
≥9.00 hours/day	0.692	1.061	0.791 to 1.425

MPA, moderate-intensity physical activity; PARI, physical activity -related injury; VPA, vigorous-intensity physical activity.