Characteristics of the male smokers at Visit 1 compared with those of subjects receiving spirometric assessment at Visit 2.

Group 1: continuing smokers who received spirometric assessment at Visit 2; Group 2: those who quit smoking before Visit 2; Group 3: continuing smokers who refused spirometric assessment at Visit 2; Group 4: subjects who did not participate in the annual health check in 2009.One subject in Group 1 was receiving anti-anaemia therapy. No subjects were receiving respiratory therapy.*P#P##PData are mean values (SD). Data for homocysteine levels was not available for four male subjects.BMI, body mass index; FVC, forced vital capacity; FEV1, forced expiratory volume in 1 s; SE, standard error; sFe, serum iron.