Table 2.

Association between low back pain and sleep quality.

Multivariate model	OR	CI (95%)	p-value
Unadjusted model girls	2.12	1.36 - 3.30	0.001
Model 1 girls (adjusted by age)	2.00	1.27 - 3.15	0.002
Model 2 girls (Model 1 girls + socioeconomic level)	1.97	1.25 - 3.10	0.003
Model 3 girls (Model 2 girls + physical activity)	1.97	1.25 - 3.10	0.003
Model 4 girls (Model 3 girls + BMI)	1.98	1.25 - 3.12	0.003
Model 5 girls (Model 4 + electronic devices*)	1.38	0.95 - 2.01	0.087
Unadjusted model boys	2.70	1.56 - 4.67	0.001
Model 1 boys (adjusted by age)	2.59	1.49 - 4.49	0.001
Model 2 boys (Model 1 boys + socioeconomic level)	2.61	1.50 - 4.53	0.001
Model 3 boys (Model 2 boys + physical activity)	2.60	1.50 - 4.52	0.001
Model 4 boys (Model 3 boys + BMI)	2.58	1.48 - 4.50	0.001
Model 5 boys (Model 4 + electronic devices*)	2.36	1.48 - 3.75	0.001

Model 1, unadjusted model adjusted by age; Model 2, Model 1 adjusted by socioeconomic level; Model 3, Model 2 adjusted by physical activity; Model 4, Model 3 adjusted by BMI.

OR, odds ratio; CI, confidence interval; BMI, Body mass index.

^*hours per day in television, smartphone/tablet, videogame, and computer in weekdays and at weekend.