Lung cancer mortality by duration of employment in specific maintenance crafts
| Specific craft | Total | 0–4 y | 5–19 y | ⩾20 y | Trend test | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Obs | SMR (95% CI) | Obs | SMR (95% CI) | Obs | SMR (95% CI) | Obs | SMR (95% CI) | χ2 | p Value | ||||||||||
| Insulator | 48 | 90 (66 to 120) | 31 | 77 (52 to 110) | 10 | 133 (63 to 245) | 7 | 128 (51 to 264) | 2.25 | 0.13 | |||||||||
| Painter | 30 | 76 (51 to 108) | 19 | 69 (41 to 108) | 8 | 100 (43 to 197) | 3 | 87 (14 to 195) | 0.03 | 0.86 | |||||||||
| Structural steel, pipe fitter, machinist | 202 | 78 (67 to 89) | 105 | 80 (65 to 97) | 46 | 71 (52 to 95) | 51 | 78 (58 to 102) | 0.04 | 0.84 | |||||||||
| Electrician, instrument | 35 | 78 (53 to 108) | 11 | 89 (44 to 160) | 19 | 97 (58 to 151) | 5 | 36 (12 to 83) | 3.40 | 0.07 | |||||||||
| Boilermaker, welder, lead burner | 52 | 65 (48 to 85) | 23 | 60 (38 to 90) | 19 | 83 (50 to 130) | 10 | 53 (26 to 98) | 0.06 | 0.80 | |||||||||
| Equipment operator | 59 | 73 (55 to 94) | 42 | 76 (54 to 103) | 9 | 50 (23 to 98) | 8 | 102 (44 to 202) | 0.13 | 0.72 | |||||||||
| Cleaner | 91 | 68 (54 to 83) | 84 | 67 (54 to 83) | 5 | 58 (18 to 136) | 2 | 147 (18 to 530) | 0.38 | 0.53 | |||||||||
| Pipefitter, boilermaker | 161 | 81 (68 to 94) | 97 | 78 (63 to 95) | 33 | 81 (55 to 113) | 31 | 90 (61 to 128) | 0.49 | 0.47 | |||||||||
| All maintenance | 419 | 74 (67 to 81) | 213 | 76 (66 to 87) | 99 | 64 (52 to 77) | 107 | 82 (67 to 98) | 0.20 | 0.65 | |||||||||