Table 7. Multivariate model for association between LBP in High School Students.

	LBP OR (95% CI)
Gender: Female	1.296(1.102-1.523)
High school year
1	0.965(0.811-1.147)
2	1
3	1.309(1.029-1.666)
Frequency of feeling soreness after exercise
Almost never	1
Occasionally	1.321(1.093-1.598)
Often	2.200(1.714-2.823)
Always	2.575(1.697-3.909)
Type of PC used: laptop	1.339(1.136-1.578)
Mobile phone use	1.311(1.048-1.639)
Sitting time (except in school)every day over 3 hours	1.246(1.042-1.490)
Feeling depressed	2.039(1.724-2.412)
Not satisfied with academic performance	1.305(1.110-1.534)
CES-D score ≥ 16	1.681(1.420-1.991)

LBP = lower back pain; OR = ORs after multiple logistic regression with forward stepwise selection.