Table 6.

Logistic regression: factors associated with knowledge of health consequences of smoking (model a)

		Dependent variables
		Knowledge on health risks of active smoking		Knowledge of health risks of secondhand smoking
Independent variables	Sub-categories	OR**	95% CI*	OR**	95% CI*
Gender	Male	1
	Female	0.8	0.7–1	0.8	0.5–1.1
Age group	25–34	1
	35–44	0.8	0.6–1	3	2.2–4.1
	45–54	0.8	0.7–1.1	2.6	2–3.4
	55–64	1	0.8–1.2	3.1	2.3–4.1
	65 and above	0.7	0.5–0.9	1.7	1.2–2.2
Education	Primary	1
	Lower secondary	1.6	1.3–1.9	2.4	1.9–3
	Upper secondary	1.7	1.3–2.2	3.9	2.6–5.8
	College or above	1.9	1.4–2.5	5.7	3.7–8.6
Income	Quintile 5	1
	Quintile 1	0.7	0.6–0.9	0.3	0.2–0.4
	Quintile 2	0.8	0.6–1	0.5	0.4–0.7
	Quintile 3	0.8	0.6–0.9	0.5	0.4–0.7
	Quintile 4	0.9	0.7–1	0.7	0.5–1
Ethnic	Kinh	1
	Non-Kinh ethnic	0.6	0.5–0.7	0.3	0.3–0.5
Access to positive information	No	1
	Yes	2.4	2.1–2.8	2.2	1.8–2.6
Access to negative information	No	1
	Yes	0.6	0.4–1.1	0.6	0.2–1.8
Area	Urban	1
	Rural	1.1	0.9–1.2	1	0.8–1.2
Region	Red River Delta	1
	Northern midland and mountain	1.2	0.9–1.5	1.8	1.1–2.9
	North Central area and Central coastal	1.2	1–1.4	1.1	0.8–1.5
	Central highlands	1.1	0.7–1.6	1	0.6–1.8
	South East	1	0.8–1.3	0.6	0.5–0.9
	Mekong River Delta	0.8	0.6–1	0.4	0.3–0.6
Regulation of ‘no smoking at home’	No	1
	Yes	1	0.8–1.3	0.8	0.6–1.2
Smoking status	Current smokers	1
	Current non-smokers	1.6	1.3–2	1.8	1.2–2.7

^*95% confidence interval

^**odds ratio.

N=9,919 individuals from 656 PSUs of 6 strata.