Association of environmental tobacco smoke exposure with socioeconomic status in a population of 7725 New Zealanders

Table 3

Associations of environmental tobacco smoke exposure with indicators of socioeconomic status

	Prevalence of regular exposure to ETS^3-150	95% CI	Minutes per week of ETS exposure^3-150	95% CI
Education^3-151
University	30	25–35	16	14–18
Polytechnic	41	38–44	28	25–30
Secondary >3 yrs	47	43–51	38	34–42
Secondary 2–3 yrs	53	49–57	50	45–55
Secondary <3 yrs	53	49–57	54	49–61
Occupation^3-151 ^3-152
ISEI 61–85	33	29–37	20	18–22
ISEI 52–60	43	39–47	30	26–35
ISEI 39–51	43	39–47	32	26–35
ISEI 30–38	55	52–58	59	54–66
ISEI 20–29	55	51–59	57	51–64
Income^3-151 ^3-153(NZ$)
43 000–70 000	33	29–37	21	19–24
37 000–42 999	44	40–48	34	30–37
32 000–36 999	45	41–49	34	31–38
26 000–31 999	48	44–52	37	33–41
15 000–25 999	50	46–54	45	40–50

↵3-150 Adjusted for age and sex.
↵3-151 F-tests for heterogeneity across socioeconomic groups: p<0.0001 for each socioeconomic indicator (both after adjustment for age and sex, and after additional adjustment for ethnicity).
↵3-152 Occupational status as assessed by the International Socioeconomic Index ISEI;9 higher scores indicate higher occupational status.
↵3-153 Median neighbourhood household income (1991 New Zealand dollars).

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