Table 2

Demographic characteristic of patients

Control (C)Smoker (S)COPDp value†C v S*C v COPD*S v COPD*
Results are expressed as median with 25–75th percentiles in parentheses.
FEV1=forced expiratory volume in 1 second.
*p value for non-parametric Bonferroni Dunn’s post hoc test.
†p value for non-parametric Kruskal-Wallis test comparing the differences between the groups.
Sex (M/F)9/56/26/4
Age (years)*50 (40–70)41 (33–59)63 (56–71)NSNSNSNS
Smoke (% of current smokers)0%100%70%
Packs/year*040 (32–45)37.5 (32.5–52)NS
FEV1 (%)*105 (100–110)93 (90–103)54 (50–62.5)0.0001p=0.009p<0.0001p<0.0001