Table 3.
Association between smoking cessation status and obstructive spirometry pattern according to age groupa.
| Variables | Obstructive spirometry patternb | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Never-smoker | Ex-smoker (cessation years) | Current smoker | |||||||||||
| ≥ 20 | 15–20 | 10–15 | 5–10 | < 5 | |||||||||
| OR | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| Age (years) | |||||||||||||
| Men | |||||||||||||
| 40–49 | 1.00 | 0.74 | (0.18 3.01) | 0.50 | (0.11 2.32) | 0.34 | (0.08 1.40) | 1.17 | (0.42 3.26) | 0.84 | (0.32 2.22) | 0.98 | (0.45 2.12) |
| 50–59 | 1.00 | 1.75 | (0.84 3.64) | 1.08 | (0.47 2.47) | 1.69 | (0.75 3.81) | 2.16 | (0.93 5.02) | 2.02 | (0.95 4.31) | 3.29 | (1.76 6.17) |
| 60–69 | 1.00 | 1.46 | (0.92 2.33) | 1.70 | (1.02 2.83) | 1.70 | (0.94 3.05) | 3.35 | (1.89 5.93) | 1.67 | (0.91 3.05) | 4.21 | (2.62 6.77) |
| 70–79 | 1.00 | 1.64 | (1.03 2.60) | 1.15 | (0.60 2.19) | 1.83 | (0.93 3.62) | 4.34 | (2.03 9.30) | 3.37 | (1.66 6.83) | 4.07 | (2.19 7.56) |
| Women | |||||||||||||
| 40–49 | 1.00 | 3.12 | (0.75 12.91) | 4.73 | (0.86 25.99) | 3.33 | (0.63 17.74) | – | – | – | – | 2.13 | (0.73 6.25) |
| 50–59 | 1.00 | 0.30 | (0.04 2.30) | – | – | 1.69 | (0.18 15.81) | – | – | 5.30 | (1.11 25.38) | 1.23 | (0.46 3.33) |
| 60–69 | 1.00 | – | – | – | – | 0.85 | (0.16 4.38) | – | – | 0.98 | (0.22 4.35) | 3.78 | (1.47 9.73) |
| 70–79 | 1.00 | 1.08 | (0.25 4.73) | – | – | – | – | 6.90 | (1.15 41.45) | 0.89 | (0.11 7.46) | 5.11 | (1.52 17.21) |
OR odds ratio, CI confidence interval.
aAdjusted for all covariates (cumulative smoking exposure, age, educational level, household income, occupation, residential area, physical activity, high-risk drinking, and height).
bObstructive spirometry pattern was defined as an FEV1/FVC < 0.7.