Table 1

Age and smoking habit by sex among responders to the Oslo asthma surveys in 1972 and 1998–1999

MalesFemales
19721998–199919721998–1999
Subjects n81557403#95398261#
Age yrs40.8 (40.4–41.1)40.7 (40.3–41.1)42.0 (41.7–42.3)40.4 (40.0–40.8)
Smokers
 Subjects %57.3 (56.2–58.4)35.2 (33.9–36.5)45.4 (44.4–46.4)33.7 (32.4–34.9)
 Cumulative cigarette consumption pack-yrs16.0 (15.6–16.5)17.3 (16.4–18.1)9.4 (9.1–9.7)14.0 (13.4–14.6)
Exsmokers
 Subjects %15.7 (15.0–16.5)21.3 (20.3–22.5)8.3 (7.8–8.9)21.8 (20.8–22.9)
 Cumulative cigarette consumption pack-yrs15.1 (14.2–15.9)13.9 (12.9–14.9)7.1 (6.5–7.7)9.5 (8.9–10.0)
  • Data are presented as mean or percentage (95% confidence interval). There were 13371 postal responders and 572 telephone responders to the follow-up in 1998–1999

  • #: responders in follow-up weighted to account for sampling of postal nonresponders (283 males represent 1134 subjects and 289 females represent 1159 subjects)