Table 2 Age at smoking onset, intensity, and smoking duration among controls according to selected smoking approaches
Smoking assessment approaches | n (%) | Age at smoking onset (years) Median (Min-Max) | Number of cigarettes/day Median (Min-Max) | Duration (years) Median (Min-Max) |
|---|---|---|---|---|
Smoking status at interview | ||||
Never | 261 (32.9) | – | – | – |
Former | 301 (37.9) | 17 (6–55) | 4.7 (1.0–60) | 26 (2–64) |
Current | 232 (29.2) | 17 (8–53) | 5.0 (0.7–40.0) | 47 (15–74)a |
Average smoking index during the life time (packs/year) | ||||
0.15–5.2 | 177 (33.2) | 18 (8–55) | 2.0 (0.7–20.0) | 23 (2–59) |
5.3–14.0 | 179 (33.6) | 17 (7–40) | 4.3 (2.0–30) | 40 (6–69) |
14.01–112.0 | 177 (33.2) | 15 (6–40)a | 11.6 (5.0–60.0)a | 45 (9–74)a |
Life course smoking patterns | ||||
Among ever smokersb | ||||
A | 474(88.9) | 17 (7–55) | 4 (0.7–40) 15.5 | 35 (2–69) |
B | 59 (11.1) | 15 (6–25) | (5.75–60.0)a | 48 (20–74)a |
Among former smokersb | ||||
A | 277 (92.0) | 17 (7–55) | 4.3 (1–30) | 25 (2–64) |
B | 24 (8.0) | 15 (6–18)a | 17.9 (8.7–60)a | 42.5 (20–56)a |