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

Table 5

Odds ratios of nonparticipation according to behavioural and psychosocial characteristics at different times during followup.

Predictors/Grade	OR^(1)	OR^(2)
	(95% CI)	(95%CI)
Grade 7
Gender (boys versus girls)	1.8 (1.6–2.2)	1.8 (1.4–2.3)
Ever smoker (versus never)	2.0 (1.7–2.4)	1.6 (1.2–2.1)
Ever snus user (versus never)	2.3 (1.9–2.8)	1.5 (1.2–1.9)
Any alcohol use during last term (yes versus no)	1.5 (1.2–1.7)	0.9 (0.7–1.2)
Intoxication drinking last term (yes versus no)	1.4 (1.1–1.8)	1.2 (0.9–1.5)
Grade 8
Gender (boys versus girls)	1.9 (1.5–2.2)	1.9 (1.5–2.3)
Ever smoker (versus never)	1.9 (1.6–2.3)	1.5 (1.2–1.9)
Ever snus user (versus never)	2.2 (1.8–2.7)	1.3 (1.1–1.7)
Truancy latest term (reference: no truancy)
1–3 days	1.5 (1.2–1.9)	1.3 (1.0–1.7)
≥4 days	2.4 (1.8–3.1)	1.9 (1.4–2.5)
Own beliefs of teacher’s judgement of school proficiency compared to classmates (reference: very good)
Good	0.9 (0.7–1.1)	1.0 (0.7–1.4)
Average	1.3 (1.0–1.7)	1.1 (0.7–1.6)
Below average	2.2 (1.4–3.5)	1.5 (0.8–2.7)
Beliefs of own school proficiency (reference: very good)
Good	1.0 (0.6–1.6)	0.7 (0.5–1.0)
Average	0.6 (0.4–1.0)	1.1 (0.8–1.5)
Below average	1.1 (0.7–1.8)	0.7 (0.4–1.3)

⁽¹⁾ Unadjusted.
⁽²⁾Adjusted for gender and all predictors in the same grade.