Table 3.

Multilevel analysis of individual and contextual variables associated with traumatic dental injury in children 8 to 10 years of age.

	Model 1 (‘null’)	Model 2		Model 3
	PR (95% CI)	p	PR (95% CI)	p	PR (95% CI)
Intercept	0.29 (0.10–0.64)		1.64 (1.43–1.86)		6.16 (5.11–7.21)
Individual variables
Sex
Male	-	-	-	-	-
Female	-	-	-	-	-
Age
8	-	-	-	-	-
9	-	-	-	-	-
10	-	-	-	-	-
Mother’s age
≤ 35 years	-	-	-	-	-
> 35 years	-	-	-	-	-
Guardian’s schooling
≤ 8 years of study	-	-	-	-	-
> 8 years of study	-	-	-	-	-
Guardian’s marital status
Single	-	<0.01	1.90 (1.50–3.34)	0.03	2.33 (1.79–2.66)
Married	-	-	1	-	1
Practice of sports at school
Yes	-	<0.01	3.68 (1.170–2.28)	0.01	2.46 (1.70–3.22)
No	-	-	1	-	1
Daily use of electronic devices
Yes	-	0.03	2.38 (1.81–2.69)	<0.01	1.78 (1.31–1.81)
No	-	-	1	-	1
Screen time per day
Excessive (> 2 h)	-	0.01	1.76 (1.71–2.56)	<0.01	3.84 (1.94–4.28)
Normal (≤ 2 h)	-	-	1	-	1
Family adaptability
Chaotic	-	0.003	1.95 (1.26–3.01)	0.04	4.22 (3.44–4.99)
Structured	-	-	1	-	1
Contextual variables
Type of school
Public	-	-	-	0.03	1.77 (1.02–3.05)
Private	-	-	-	-	1
Type of courtyard  Cement  Sand	- -	- -	1 -	0.04 -	1.99 (1.15–3.15) 1
Ramps/stairs with handrail
No	-	-	-	-	-
Yes	-	-	-	-	-
Deviance (-2loglikelihood)	40371.18	-	36624.19	-	29339.90

Values are presented as OR (95% CI). VPC, variance partition coefficient for random intercepts of mixed effects models. * Significance level at p < 0.05. ^a*Unconditional model. ^b*Individual covariates. ^c*Subject and school-level covariates.