Psychosocial Determinants of Attrition in a Longitudinal Study of Tobacco Use in Youth

Table 4

Odds ratios of nonparticipation according to behavioural psychosocial characteristics at baseline.

Predictor	OR^(1)	OR^(2)
	(95% CI)	(95% CI)
Gender (boys versus girls)	1.6 (1.4–1.9)	1.5 (1.3–1.8)
Ever smoker at baseline (versus never)	1.7 (1.4–2.1)	1.4 (1.2–1.7)
Not born in Sweden (versus born in Sweden)	1.6 (1.2–2.2)	1.6 (1.2–2.2)
Mother and father living together at baseline (no versus yes)	1.6 (1.4–1.9)	1.5 (1.2–1.8)
Change of residence (yes versus no)	1.6 (1.3–2.0)	1.3 (1.0–1.7)
Parental unemployment (yes versus no)	1.5 (1.2–2.0)	1.4 (1.0–1.8)
Number of friends in leisure time (reference: 1–4)
None	3.1 (1.3–7.5)	2.4 (0.9–6.6)
>4	1.3 (1.2–1.6)	1.3 (1.1–1.5)

⁽¹⁾ Unadjusted.
⁽²⁾ Adjusted for all other predictors in table.