Table 2.
Occupational Characteristics of Participants at Recruitment
| HAA Measured at Exam 1 | Cohort Included in HAA Model | Cohort Included in ILA Model | |
|---|---|---|---|
| Participants, n | 6,813 | 5,702 | 2,312 |
| Employment status* | |||
| Homemaker | 774 (11.6) | 391 (6.9) | 151 (6.5) |
| Employed | 3,220 (48.1) | 2,973 (52.1) | 1,385 (59.9) |
| Unemployed | 154 (2.3) | 127 (2.2) | 45 (1.9) |
| Retired | 2,543 (38.0) | 2,211 (38.8) | 731 (31.6) |
| Job exposure matrix–assigned exposures† | |||
| VGDF score | |||
| Low | 4,913 (76.2) | 4,389 (77.0) | 1,816 (78.6) |
| Intermediate | 1,055 (16.4) | 901 (15.8) | 341 (14.8) |
| High | 481 (7.5) | 412 (7.2) | 155 (6.7) |
| Gas/vapor‡ | 1,180 (18.3) | 1,008 (17.7) | 379 (16.4) |
| Dust‡ | 910 (14.1) | 782 (13.7) | 281 (12.2) |
| Inorganic | 397 (6.2) | 350 (6.1) | 125 (5.4) |
| Organic | 468 (7.3) | 393 (6.9) | 146 (6.3) |
| Fumes‡ | 306 (4.7) | 262 (4.6) | 98 (4.2) |
| Self-reported exposures§ | |||
| Dust | 1,454 (37.0) | 1,398 (38.1) | 776 (38.9) |
| Gas/vapor | 735 (18.8) | 709 (19.4) | 418 (21.1) |
| Fumes | 929 (23.7) | 895 (24.4) | 502 (25.2) |
| Any VGDF exposure‖ | 1,713 (43.5) | 1,651 (44.9) | 923 (46.3) |
| Severity¶ | |||
| None | 2,212 (56.4) | 2,017 (55.0) | 1,070 (53.7) |
| Mild | 977 (24.9) | 946 (25.8) | 537 (27.0) |
| Moderate | 537 (13.7) | 514 (14.0) | 286 (14.4) |
| Severe | 196 (5.0) | 188 (5.1) | 99 (5.0) |
| No. of VGDF agents** | |||
| 0 | 2,212 (56.7) | 2,017 (55.4) | 1,070 (54.0) |
| 1 | 798 (20.5) | 772 (21.2) | 429 (21.7) |
| 2 | 386 (9.9) | 370 (10.2) | 197 (10.0) |
| 3 | 503 (12.9) | 484 (13.3) | 284 (14.3) |
| Length of exposure to VGDF, yr | 18.2 ± 12.7 | 18 ± 12.8 | 17.6 ± 12.5 |
Definition of abbreviations: HAA = high-attenuation areas; ILA = interstitial lung abnormalities; VGDF = vapors, gas, dust, and fumes.
Occupational characteristics obtained from questionnaires administered during exam 4. Data are presented as mean ± SD or n (%) unless otherwise stated.
Employment status at recruitment. Data are missing for 122 at exam 1.
Job exposure matrix–assigned exposures missing for 364 at exam 1.
Exposure score dichotomized into “low” versus “intermediate/high.”
Self-reported exposures missing for dust in 2,883, vapors/gas in 2,901, and fumes in 2,891 at exam 1; dust in 2,029, vapors/gas in 2,047, and fumes in 2,037 in the HAA cohort; and dust in 317, vapors/gas in 327, and fumes in 323 in the ILA cohort.
Self-reported exposure to any VGDF agent missing for 2,877 at exam 1, 2,024 in the HAA cohort, and 332 in the ILA cohort.
Self-reported severity missing for 2,891 at exam 1, 2,037 in the HAA cohort, and 320 in the ILA cohort.
Total number of VGDF-constituent agents, calculated from self-reported exposure. Data are missing for 2,914 at exam 1, 2,059 in the HAA cohort, and 322 in the ILA cohort.