Table 3—

Multiple linear regression analyses of data obtained at the three surveys(1976–2004) of random samples of 20–35-yr-old Danes with forced expiratory volume in 1 s (FEV1) % predicted as the dependent variable

VariableRegression coefficient (95% CI)
1976–1978
 Smoking-2.0 (-3.1– -0.3)
 BMI
  25–30 kg·m−2-0.3 (-1.0–0.8)
  >30 kg·m−2-0.9 (-2.1–1.1)
 Asthma-2.3 (-9.4–4.6)
1991–1994
 Smoking-2.9 (-5.9– -0.3)
 BMI
  25–30 kg·m−2-1.4 (-2.2– -0.6)
  >30 kg·m−2-3.3 (-5.2– -1.6)
 Asthma-10.7 (-13.4– -7.9)
2001–2004
 Smoking-4.6 (-5.8– -3.4)
 BMI
  25–30 kg·m−2-1.5 (-2.9– -0.3)
  >30 kg·m−2-4.9 (-6.1– -3.8)
 Asthma-14.2 (-16.5– -12.1)
  • Data are presented in the units of the dependent variable (FEV1 % pred). Smoking and asthma status were included in the model as dichotomous variables (with nonsmoker and no asthma as reference), whereas body mass index (BMI) was included in the model in three categories, i.e. BMI >25, BMI 25–30 and BMI >30 (with BMI <25 as reference).