Table 1

Characteristics of study participants (n=3206)

Active group
(n=1613)
Control group
(n=1593)
Centre
 Florence795 (49%)783 (49%)
 Pisa395 (25%)392 (25%)
 Pistoia423 (26%)418 (26%)
Age at entry (years)
 <5553 (3%)64 (4%)
 55–59687 (43%)616 (39%)
 60–64497 (31%)526 (33%)
 65–69371 (23%)382 (24%)
 >695 (0.3%)5 (0.3%)
 Mean age at entry60.960.7
Sex
 Male1035 (64%)1039 (65%)
 Female578 (36%)554 (35%)
Smoking status
 Current1059 (66%)1018 (64%)
 Former554 (34%)575 (36%)
Median pack-years of smoking4038