Table 8. Characteristics of the male smokers at Visit 1 compared with those of subjects receiving spirometric assessment at Visit 2.
| Group 1 (n = 147) | Group 2 (n = 32) | Group 3 (n = 10) | Group 4 (n = 334) | P (ANOVA) | |
| age, years | 56.4 (9.1) | 60.1 (7.7) | 61.3 (6.5) | 61.2 (10.9)* | <0.0001 |
| Body mass index, kg/m2 | 22.8 (2.8) | 23.3 (2.0) | 24.1 (2.6) | 22.9 (3.1) | 0.454 |
| Brinkman index, cigarette·year | 751.7 (413.8) | 661.7 (293.6) | 859.4 (356.1) | 762.3 (343.9) | 0.439 |
| haemoglobin, g/dL | 15.1 (1.2) | 14.8 (0.8) | 14.8 (1.1) | 14.8 (1.2) | 0.243 |
| sFe, µg/dL | 120.2 (45.2) | 116.1 (36.7) | 111.5 (51.8) | 117.2 (41.0) | 0.273 |
| homocysteine, µM | 12.4 (4.4) | 11.7 (2.4) | 15.1 (4.7) | 13.8 (12.1) | 0.403 |
| uric acid, mg/dL | 5.8 (1.2) | 5.7 (1.2) | 5.5 (0.6) | 5.6 (1.3) | 0.729 |
| FVC %predicted visit 1 | 94.4 (13.5) | 99.1 (13.2) | 98.4 (13.2) | 94.7 (15.5) | 0.342 |
| FEV1%predicted visit 1 | 92.4 (15.9) | 97.6 (13.2) | 91.6 (12.4) | 90.4 (18.6) | 0.136 |
| FEV1/FVC visit 1, % | 77.3 (8.4) | 77.9 (7.8) | 73.6 (7.9) | 74.8 (10.1)* | 0.031 |
| FVC %predicted visit 2 | 98.5 (14.4)# | – | – | – | – |
| FEV1%predicted visit 2 | 91.9 (17.1) | – | – | – | – |
| FEV1/FVC visit 2, % | 73.0 (9.3)## | – | – | – | – |
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<0.05 vs Group 1 by ANOVA followed by Tukey’s test.
#
P<0.05,
##
P<0.001 vs Visit 1 by Student’s t-test.
Data 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.