Table 3

Age-standardized prevalence rates (95% CI), OR, PR, and RII of current cigarette smoking by calendar year, gender, and socioeconomic position indicators: 147,805 South Korean men and women aged 25–64 from 1999, 2003, 2006 Social Statistics Survey


1999
2003
2006
p for trend

Men
69.9 (68.8–70.9)
58.9 (57.9–59.9)
56.1 (55.1–57.0)

Occupational class




     Non-manual
61.7 (59.7–63.8)
50.7 (48.9–52.4)
47.7 (46.0–49.3)

     Manual
73.6 (72.2–75.0)
63.2 (61.9–64.6)
61.0 (59.6–62.4)

     Others
70.6 (67.3–73.9)
61.3 (58.2–64.4)
59.2 (56.1–62.3)

     OR (95% CI) of manual vs. non-manual
1.72 (1.62–1.84)
1.67 (1.57–1.77)
1.71 (1.61–1.82)
0.890
     OR (95% CI) of others vs. non-manual
1.28 (1.17–1.40)
1.35 (1.24–1.47)
1.38 (1.27–1.51)
0.202
     PR (95% CI) of manual vs. non-manual
1.17 (1.15–1.20)
1.23 (1.20–1.26)
1.27 (1.23–1.30)
< 0.0001
     PR (95% CI) of others vs. non-manual
1.06 (1.03–1.09)
1.10 (1.07–1.15)
1.13 (1.08–1.17)
0.009
Education




     College or higher
61.2 (59.2–63.1)
50.4 (48.9–52.0)
48.5 (47.0–50.0)

     High school
72.5 (70.8–74.2)
63.1 (61.5–64.6)
61.5 (59.8–63.1)

     Middle school or less
74.0 (70.7–77.2)
65.5 (60.9–70.1)
64.2 (58.3–70.0)

     RII (95% CI) by logistic regression
2.69 (2.41–3.00)
2.82 (2.55–3.12)
2.83 (2.55–3.13)
0.524
     RII (95% CI) by log-binomial regression
1.31 (1.27–1.35)
1.51 (1.46–1.57)
1.58 (1.51–1.64)
< 0.0001

Women
3.1 (2.9–3.4)
2.9 (2.7–3.1)
3.2 (3.0–3.4)

Occupational class




     Non-manual
1.9 (0.9–2.9)
1.3 (0.9–1.8)
1.5 (1.1–1.9)

     Manual
4.1 (3.7–4.5)
3.9 (3.4–4.4)
4.6 (4.1–5.2)

     Others
2.6 (2.3–3.0)
3.0 (2.7–3.3)
3.0 (2.6–3.3)

     OR (95% CI) of manual vs. non-manual
1.74 (1.28–2.37)
2.28 (1.70–3.05)
2.61 (2.02–3.38)
0.071
     OR (95% CI) of others vs. non-manual
1.19 (0.87–1.63)
2.01 (1.51–2.69)
1.84 (1.42–2.38)
0.058
     PR (95% CI) of manual vs. non-manual
1.71 (1.26–2.32)
2.24 (1.68–2.98)
2.55 (1.98–3.27)
0.072
     PR (95% CI) of others vs. non-manual
1.20 (0.88–1.63)
1.99 (1.49–2.64)
1.81(1.41–2.33)
0.063
Education




     College or higher
1.9 (1.1–2.7)
1.6 (1.1–2.2)
1.6 (1.2–2.0)

     High school
2.8 (2.4–3.2)
3.2 (2.9–3.6)
3.9 (3.5–4.4)

     Middle school or less
3.8 (3.2–4.3)
4.1 (3.0–5.2)
7.5 (4.5–10.5)

     RII (95% CI) by logistic regression
2.28 (1.63–3.19)
3.28 (2.38–4.53)
3.52 (2.60–4.78)
0.067
     RII (95% CI) by log-binomial regression
2.22 (1.61–3.08)
3.17 (2.32–4.34)
3.39 (2.52–4.56)
0.066

CI = confidence intervals; OR = odds ratio; PR = prevalence ratio; RII = relative index of inequality.

Khang et al. BMC Public Health 2008 8:66   doi:10.1186/1471-2458-8-66