Table 2

 Baseline characteristics for 2022 subjects who participated in all four examinations

Never smokers(n = 581)Ex-smokers(n = 371)Early cessation(n = 93)Intermediate cessation(n = 153)Late cessation(n = 210)Continuous smokers (n = 614)All(n = 2022)
Age (years)45.747.345.146.944.444.245.4
Women (%)75.756.354.847.155.258.361.6
Age when started smoking (years)18.420.619.219.819.019.2
Pack-years (years)14.818.416.719.118.2
Exposure to welding dust (%)8.610.05.317.012.916.112.1
No education (%)25.726.624.222.929.527.226.5
High education (%)6.98.47.77.25.25.46.6