Figure 1 Cross‐sectional relation between serum C‐reactive protein (CRP) levels (mg/l) in deciles and forced expiratory volume in 1 s (FEV₁) in (A) 1991 and (B) 2000. The lowest decile of serum CRP is the reference value. Analysis adjusted for sex, age, age², height, age‐height interaction, body mass index, dietary magnesium intake, current smoking status and number of cigarettes consumed in pack‐years.