Table 4 Mean annual change in FEV1 per pack-year to 1991 and per pack of cigarettes smoked per day between 1991 and 2002 in quitters* and persistent smokers
Term | Annual change in mL per pack-year to 1991 | Annual change in mL per packs per day between 1991 and 2002 | |||||
|---|---|---|---|---|---|---|---|
Coef | 95%CI | p value | Coef | 95%CI | p value | ||
Quitters† | |||||||
Men (n = 245) | Linear | -0.1 | -0.4, 0.3 | 0.78 | -14.3 | -22.6, -6.0 | 0.001 |
Women (n = 179) | Linear | 1.5 | 0.3, 2.6 | 0.01 | -6.4 | -17.6, 4.6 | 0.25 |
Quadratic | -0.04 | -0.08,-0.01 | 0.01 | na | na | na | |
Cubic | 0.0004 | 0.0001,0.0006 | 0.006 | na | na | na | |
Persistent smokers† | |||||||
Men (n = 595) | Linear | -0.1 | -0.3, 0.12 | 0.41 | -9.0 | -15.4, -2.5 | 0.006 |
Women (n = 556) | Linear | 1.4 | 0.5, 2.3 | 0.001 | -11.6 | -19.8, -3.5 | 0.005 |
Quadratic | -0.06 | -0.08, -0.02 | <0.001 | na | na | na | |
Cubic | 0.0006 | 0.0003, 0.0008 | <0.001 | na | na | na | |