Characteristics of subjects with age ≥18 years and history in coke ovens ≥1 year at the dates of last sets of lung function tests
| Group | |||||
|---|---|---|---|---|---|
| Operation | Maintenance | Electricity | Other | Total | |
| *Only subjects with two or more sets of tests are included. | |||||
| †Proportions of non-smokers, ex-smokers, and current smokers in each group. | |||||
| ‡Pure history means subjects had only one type of work position during the lung function surveillance period. | |||||
| §Mixed history means subjects had more than one type of work position during the lung function surveillance period. | |||||
| Total subjects (no.) | 448 | 180 | 112 | 94 | 834 |
| Subjects with 1 set tests | 85 | 77 | 53 | 41 | 256 |
| 2 or more sets | 363 | 103 | 59 | 53 | 578 |
| Sets of tests, mean (SD) | 5.9 (3.8) | 3.9 (3.6) | 4.0 (3.6) | 2.9 (2.7) | 4.9 (3.8) |
| Span between first and last tests*, mean (SD) | 7.8 (3.2) | 7.2 (3.3) | 7.6 (3.1) | 4.8 (3.4) | 7.4 (3.3) |
| Age (years), mean (SD) | 42.4 (12.0) | 40.8 (14.6) | 40.1 (14.1) | 41.8 (13.3) | 41.7 (13.0) |
| Min–max (years) | 18.5–65.0 | 19.9–65.5 | 19.7–64.4 | 18.8–64.5 | 18.5–65.5 |
| Height (cm), mean (SD) | 170.8 (7.3) | 172.3 (6.9) | 174.0 (8.1) | 174.2 (7.9) | 171.9 (7.5) |
| Min–max (cm) | 140–191 | 153–194 | 154–196 | 158–194 | 140–196 |
| Non-smokers, no. (%)† | 81 (18) | 34 (19) | 22 (20) | 12 (13) | 149 (18) |
| Ex-smokers, no. (%)† | 105 (23) | 36 (20) | 25 (22) | 17 (18) | 183 (22) |
| Smoking duration (years), mean (SD) | 15.6 (10.7) | 18.9 (13.3) | 17.2 (10.9) | 13.9 (11.1) | 16.3 (11.3) |
| Current smokers, no. (%)† | 262 (59) | 110 (61) | 65 (58) | 65 (69) | 502 (60) |
| Pack-years, mean (SD) | 13.7 (16.3) | 13.1 (20.2) | 14.0 (21.1) | 13.0 (23.1) | 13.5 (18.7) |
| Work duration in “operation” (years), mean (SD) | 11.6 (7.9) | 0.6 (1.8) | 0.2 (1.0) | 0.5 (1.3) | 6.4 (8.1) |
| Work duration other than in “operation” (years), mean (SD) | 0.5 (1.8) | 11.1 (9.3) | 11.1 (8.5) | 10.7 (8.6) | 5.4 (8.1) |
| Pure history‡, no. (%) | 365 (81) | 101 (56) | 77 (69) | 59 (63) | 602 (72) |
| Mixed history§, no. (%) | 83 (19) | 79 (44) | 35 (31) | 35 (37) | 232 (28) |