Table 1 Characterististics of groups of study subjects
Variable | Subjects in 1992 | Subjects in2010 | Subjects of Cases form controls | Rural replication subjects | Urban replication subjects | |||||
|---|---|---|---|---|---|---|---|---|---|---|
Cases | Controls | Cases | Controls | Cases | Controls | Cases | Controls | Cases | Controls | |
No. of subjects | 306 | 743 | 409 | 611 | 112 | 587 | 374 | 377 | 541 | 560 |
Age (±SD) (yr) | 50.81 ± 6.17 | 49.19 ± 6.19 | 67.58 ± 7.12 | 66.93 ± 6.20 | 66.70 ± 6.24 | 66.58 ± 6.35 | 62.46 ± 9.28 | 61.39 ± 10.13 | 65.73 ± 9.13 | 64.55 ± 9.86 |
Male (%) | 286 (93.5%) | 684(92.1%) | 385(94.1%) | 566(92.6%) | 106(94.6%) | 546(93.0%) | 304(81.3%) | 309(82.0%) | 443(81.9%) | 445(79.5%) |
Pack-years (±SD) | 28.74 ± 16.57 | 25.58 ± 15.76 | 40.42 ± 24.40 | 43.29 ± 34.75 | 37.75 ± 18.77 | 40.29 ± 32.95 | 26.64 ± 21.13 | 22.74 ± 20.62 | 41.22 ± 48.42 | 45.68 ± 20.14 |
Post-FEV1 (±SD) | 2.03 ± 0.52 | 2.82 ± 0.57 | 1.58 ± 0.62 | 2.43 ± 0.57 | 1.91 ± 0.61 | 2.45 ± 0.53 | 1.54 ± 0.70 | 2.59 ± 0.76 | 1.15 ± 0.58 | 2.31 ± 0.69 |
Post-FEV1%pre (±SD) | 63.36 ± 27.01 | 108.15 ± 32.9 | 54.14 ± 22.03 | 97.23 ± 27.29 | 60.98 ± 14.43 | 98.01 ± 25.19 | 66.11 ± 25.19 | 106.8 ± 19.71 | 46.63 ± 20.26 | 121.3 ± 15.79 |
Post-FEV1/FVC ratio (±SD) | 60.18 ± 7.36 | 78.70 ± 6.19 | 57.28 ± 9.48 | 78.22 ± 5.79 | 61.71 ± 7.15 | 78.22 ± 5.79 | 55.04 ± 11.46 | 78.70 ± 6.17 | 50.95 ± 12.47 | 82.34 ± 8.19 |