Table 3 Demographic and occupational profile of the studied cohort
Workplace (occupation) | N (%) | Males, N (%)* | Age at inclusion, years* | Years in service at inclusion* | Daily smokers, N (%)* | Subjects with diagnoses, N (%)* | Mean annual Ni air conc, mg/m3 |
|---|---|---|---|---|---|---|---|
Overall | 1424 (100) | 1247 (88) | 39 (31–47) | 14 (8–22) | 838 (59) | 1215 (85) | - |
Smelter | 222 (16) | 222 (100) | 40 (32–47) | 16 (11–23) | 148 (67) | 191 (86) | 3.181 |
Metalworker | 209 (15) | 209 (100) | 39 (32–47) | 15 (9–21) | 148 (71) | 183 (88) | 0.734 |
Electrician | 151 (11) | 151 (100) | 39 (28–46) | 14 (6–23) | 90 (60) | 134 (89) | 0.646 |
Crane operator | 128 (9) | 51 (40) | 40 (33–48) | 18 (8–24) | 57 (45) | 108 (84) | 2.375 |
Burner | 120 (8) | 120 (100) | 37 (31–43) | 13 (10–20) | 65 (54) | 90 (75) | 4.202 |
Welder | 70 (5) | 70 (100) | 33 (27–39) | 10 (5–17) | 51 (73) | 54 (77) | 0.568 |
Metal cleaner | 43 (3) | 43 (100) | 46 (36–50) | 20 (11–25) | 27 (63) | 38 (88) | 1.050 |
Foreman | 43 (4) | 43 (100) | 37 (31–44) | 11 (7–16) | 26 (60) | 36 (84) | 1.600 |
Rigger | 38 (3) | 38 (100) | 45 (33–47) | 17 (10–23) | 22 (58) | 32 (84) | 0.950 |
Crusher operator | 37 (2) | 28 (76) | 46 (36–52) | 15 (10–23) | 13 (35) | 35 (95) | 6.760 |
Batcher | 36 (2) | 15 (42) | 42 (31–49) | 12 (7–18) | 17 (47) | 29 (81) | 1.311 |
Gas purification operator | 35 (2) | 34 (97) | 30 (22–39) | 7 (2–14) | 19 (54) | 23 (66) | 1.422 |
Converter operator | 31 (2) | 31 (100) | 44 (26–49) | 17 (3–26) | 19 (61) | 26 (84) | 3.864 |
Flotation operator | 19 (1) | 5 (26) | 45 (31–49) | 14 (9–26) | 8 (42) | 17 (89) | 0.198 |
Mill operator | 19 (1) | 19 (100) | 42 (26–49) | 19 (5–26) | 11 (58) | 17 (89) | 2.856 |
Others | 223 (16) | 168 (75) | 40 (33–49) | 13 (8–21) | 117 (52) | 202 (91) | - |