Age-adjusted OR and 95% CI and RII in smoking by SES from 2001 to 2014
| KNHANES | |||||
| II 2001 | III 2005 | IV 2007–2009 | V 2010–2012 | VI 2013–2014 | |
| Men | |||||
| Education (year) | |||||
| ≥13 | 1 | 1 | 1 | 1 | 1 |
| 10–12 | 1.75 (1.45 to 2.12) | 1.86 (1.53 to 2.25) | 1.57 (1.37 to 1.81) | 1.47 (1.27 to 1.71) | 1.48 (1.23 to 1.78) |
| 7–9 | 1.48 (1.14 to 1.93) | 1.57 (1.13 to 2.18) | 2.16 (1.72 to 2.71) | 1.62 (1.27 to 2.05) | 1.25 (0.92 to 1.72) |
| ≤6 | 2.41 (1.72 to 3.37) | 2.22 (1.62 to 3.05) | 1.95 (1.53 to 2.48) | 1.71 (1.32 to 2.22) | 1.77 (1.26 to 2.49) |
| RII (95% CI) | 2.73 (1.97 to 3.79) | 2.75 (2.00 to 3.79) | 2.74 (2.16 to 3.48) | 2.16 (1.69 to 2.77) | 2.17 (1.57 to 3.00) |
| p For trend | 0.193 | ||||
| Income | |||||
| Q1 (highest) | 1 | 1 | 1 | 1 | 1 |
| Q2 | 1.23 (0.97 to 1.55) | 1.34 (1.05 to 1.72) | 1.31 (1.11 to 1.56) | 1.09 (0.91 to 1.30) | 1.26 (1.00 to 1.59) |
| Q3 | 1.49 (1.17 to 1.91) | 1.50 (1.21 to 1.86) | 1.56 (1.32 to 1.85) | 1.23 (1.01 to 1.49) | 1.34 (1.07 to 1.66) |
| Q4 (lowest) | 1.74 (1.35 to 2.24) | 1.87 (1.46 to 2.40) | 1.79 (1.51 to 2.12) | 1.50 (1.24 to 1.81) | 1.43 (1.15 to 1.79) |
| RII (95% CI) | 2.10 (1.53 to 2.89) | 2.22 (1.63 to 3.02) | 2.16 (1.74 to 2.68) | 1.71 (1.34 to 2.18) | 1.57 (1.19 to 2.08) |
| p For trend | 0.087 | ||||
| Women | |||||
| Education (year) | |||||
| ≥13 | 1 | 1 | 1 | 1 | 1 |
| 10–12 | 1.25 (0.75 to 2.09) | 3.69 (2.07 to 6.57) | 3.95 (2.78 to 5.62) | 2.80 (1.97 to 4.00) | 4.08 (2.67 to 6.22) |
| 7–9 | 1.55 (0.76 to 3.15) | 4.04 (1.95 to 8.34) | 6.47 (3.90 to 10.7) | 6.15 (3.65 to 10.4) | 7.75 (4.12 to 14.6) |
| ≤6 | 1.98 (1.00 to 3.90) | 4.12 (1.92 to 8.86) | 7.59 (4.42 to 13.0) | 5.52 (3.06 to 9.9) | 9.53 (4.88 to 18.6) |
| RII (95% CI) | 1.75 (0.87 to 3.52) | 3.41 (1.78 to 6.55) | 8.27 (5.05 to 13.6) | 6.81 (3.86 to 12.0) | 10.29 (5.23 to 20.2) |
| p For trend | <0.001 | ||||
| Income | |||||
| Q1 (highest) | 1 | 1 | 1 | 1 | 1 |
| Q2 | 0.53 (0.29 to 0.95) | 1.05 (0.58 to 1.91) | 0.95 (0.64 to 1.42) | 0.98 (0.66 to 1.46) | 1.54 (0.82 to 2.89) |
| Q3 | 0.67 (0.39 to 1.13) | 1.50 (0.90 to 2.51) | 1.46 (1.02 to 2.09) | 1.48 (0.99 to 2.23) | 2.28 (1.29 to 4.00) |
| Q4 (lowest) | 1.53 (0.95 to 2.47) | 2.74 (1.68 to 4.46) | 2.23 (1.57 to 3.17) | 2.53 (1.75 to 3.65) | 3.95 (2.34 to 6.66) |
| RII (95% CI) | 1.92 (0.88 to 4.21) | 4.45 (2.26 to 8.76) | 3.36 (2.10 to 5.39) | 4.11 (2.46 to 6.88) | 6.27 (3.22 to 12.20) |
| p For trend | 0.043 | ||||
KNHANES, Korean National Health and Nutrition Examination Survey; RII, relative index of inequality; SES, socioeconomic status.