Table 4

Health behaviour and mental health problems in the10th grade as predictors of medical benefits follow-up in girls (n=7003)

	Crude			Model 1*			Model 2†			Model 3			Model 4
	HR	95% CI		HR	95% CI		HR	95% CI		HR	95% CI		HR	95% CI
Health behaviour
Smoking
No	ref.			ref.						ref.			ref.
Sometimes	1.22	0.95	1.58	1.18	0.91	1.53				1.29	0.98	1.70	1.19	0.90	1.56
Yes, every day	2.31	1.87	2.85	1.82	1.46	2.29				1.81	1.39	2.35	1.47	1.12	1.93
Alcohol consumed last year
Never	1.41	1.08	1.84	1.45	1.09	1.93				1.50	1.12	2.00	1.41	1.04	1.89
A few times last year	ref.			ref.						ref.			ref.
1–3 times a month	1.31	1.02	1.68	1.19	0.93	1.53				1.01	0.78	1.31	1.03	0.79	1.35
Once a week or more	1.53	1.14	2.06	1.56	1.15	2.10				1.10	0.79	1.53	1.04	0.75	1.46
Physical activity (h/week)
0	ref.			ref.						ref.			ref.
1–2	0.59	0.46	0.75	0.66	0.52	0.86				0.70	0.55	0.91	0.79	0.61	1.02
3–4	0.36	0.27	0.48	0.43	0.32	0.57				0.46	0.35	0.62	0.56	0.41	0.75
5–7	0.34	0.24	0.46	0.41	0.30	0.57				0.46	0.33	0.65	0.55	0.39	0.77
8 or more	0.25	0.16	0.39	0.32	0.20	0.50				0.36	0.23	0.56	0.41	0.26	0.65
SDQ
Conduct problems	1.31	1.24	1.38	1.25	1.19	1.32	1.21	1.14	1.29
Hyperactivity–inattention problems	1.22	1.17	1.27	1.17	1.12	1.23	1.14	1.09	1.20
Emotional symptoms	1.22	1.26	1.38	1.19	1.15	1.24	1.17	1.13	1.21
Peer problems	1.32	1.26	1.38	1.27	1.21	1.34	1.26	1.20	1.32

*Model 1: Health behaviour and the SDQ subscales separately adjusted for ethnic background, county of residence, parents’ education, income and marital status (seven analyses).
†Model 2: The SDQ subscales studied separately, adjusted for health behaviour, ethnic background, county of residence, parents’ education, income and marital status (four analyses).
SDQ, Strengths and Difficulties Questionnaire.