Table 3 Regression coefficients and 95% confidence intervals for the rate of FEV1 (ml/year) change between age 43 and 53 years by smoking trajectories, most recent smoking status and smoking status at 25
years*
| Regression coefficient (95% CI)† | |||
| Men (n = 1234) | Women (n = 1306) | All (n = 2540)‡ | |
| Smoking trajectories (n) | |||
| Never smoker (737) | 0 | 0 | 0 |
| Predominantly non-smoker (896) | 1.20 (−4.80 to 7.19) | 1.30 (−3.26 to 5.76) | 1.61 (−2.13 to 5.34) |
| Predominantly smoker (532) | −8.04 (−14.76 to −1.31) | −6.37 (−11.58 to −1.16) | −6.0 (−10.26 to −1.74) |
| Lifelong smoker (375) | −24.8 (−32.25 to −16.91) | −15.44 (−21.20 to −9.68) | −17.61 (−22.34 to −12.84) |
| Most recent smoking status (n) | |||
| Never smoker (737) | 0 | 0 | 0 |
| Former smoker (909) | −1.56 (−7.50 to 4.38) | −2.51 (−7.15 to 2.12) | 0.82 (−4.59 to 2.94) |
| Current smoker (894) | −12.91 (−19.16 to −6.66) | −6.13 (−10.53 to 1.73) | −8.44 (−12.21 to −4.68) |
| Smoking status at 25 years (n) | |||
| Never smoker (722) | 0 | 0 | 0 |
| Former smoker (588) | 1.17 (−5.61 to 7.96) | 0.39 (−4.57 to 5.35) | 0.5 (−3.65 to 4.71) |
| Current smoker (839) | −14.32 (−20.44 to −8.20) | −10.1 (−14.72 to 5.48) | −11.0 (−14.86 to −7.21) |
| Missing (391) | −6.34 (−13.69 to 1.02) | −23.3 (−8.20 to 3.54) | −3.40 (−8.13 to 1.33) |
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*Adjusted for FEV1 level at age 43 years (baseline) and height at age 53 years.
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†Negative coefficient refers to a decline in lung function.
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‡n for sample with complete data.
