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Table 2 Age at smoking onset, intensity, and smoking duration among controls according to selected smoking approaches

From: Smoking and prostate cancer: a life course analysis

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
  1. aWilcoxon rank-sum test p<0.05
  2. bPattern A, characterized by males who reported low and constant smoking intensity and Pattern B, males with initial period of low smoking intensity, followed by an increase during the second period