Elevated depressive symptoms and adolescent injury: examining associations by injury frequency, injury type, and gender

Table 2 Multivariable Negative Binomial Regression of total number of injuries on depression and covariates (IRR and 95% CIs reported)

Variable	Model 1	95% CI	Model 2	95% CI
Higher risk of depression	1.41***	1.26, 1.57	1.42***	1.27, 1.58
Lower risk of depression	Ref	Ref	Ref	Ref
Grade level
10	1.24***	1.11, 1.39	1.20***	1.08, 1.35
11	1.10*	0.99, 1.22	1.08	0.97, 1.20
12	Ref		Ref
Gender
Male	1.16***	1.06, 1.26	1.14***	1.04, 1.25
Female	Ref		Ref
Weekly spending money, $
40 or more	1.07	0.97, 1.18	1.07	0.99, 1.20
Unknown	1.06	0.93, 1.20	1.07	0.93, 1.21
Below 40	Ref		Ref
Risk taking behaviours
Current smoker	1.20**	1.04, 1.39	1.17**	1.01, 1.35
Nonsmoker	Ref		Ref
Heavy drinking	1.25***	1.09, 1.42
Light drinking	1.08	0.96, 1.23
No drink	Ref
Frequent marijuana use			1.34***	1.18, 1.53
Infrequent marijuana use			1.13**	1.01, 1.28
No marijuana			Ref
Multiple partners	1.54***	1.33, 1.78	1.46***	1.26, 1.69
Single partner	1.19***	1.07, 1.32	1.18***	1.07, 1.30
Sexually inactive	Ref		Ref
Individual school measures
Academic Marks ≥70%	1.00	0.89, 1.12	1.02	0.92, 1.14
Academic Marks <70%	Ref		Ref
Absence from school 3 days or more	1.16**	1.01, 1.32	1.14	1.00, 1.29
Absence from school 1 or 2 days	1.053	0.95, 1.17	1.05	0.95, 1.17
No absence from school	Ref		Ref
School team sports	1.22***	1.11, 1.34	1.25***	1.14, 1.36
No school team sports	Ref		Ref

ISSN: 1471-2458