Data are presented as mean±sd, unless otherwise stated. PTSD: post-traumatic stress disorder; FEV₁: forced expiratory volume in 1 s; FVC: forced vital capacity; % pred: % predicted; ECCS: European Community for Coal and Steel; NHANES III: Third National Health and Nutrition Examination Survey. ^#: post hoc pairwise comparisons (Bonferroni) indicated that nontraumatised subjects had significantly higher values than the two other groups, which did not differ from each other; ^¶: post hoc pairwise comparisons (Bonferroni) indicated that traumatised subjects had significantly lower values than nontraumatised participants but PTSD-positive subjects did not differ from the two other groups; ⁺: post hoc pairwise comparisons (Bonferroni) did not reveal any group differences; ^§: post hoc pairwise comparisons (Bonferroni) indicated that PTSD-positive subjects had significantly lower predicted values than nontraumatised participants, who did not differ from the traumatised group.