Mean lung function values at first and last observation in 651 workers stratified by job group and smoking
| Job group | n | First observation | Last observation | Annual change in lung function | |||
|---|---|---|---|---|---|---|---|
| % of predicted FEV1 AM* (95% CI)† | % of predicted FVC AM* (95% CI)† | % of predicted FEV1 AM* (95% CI)† | % of predicted FVC AM* (95% CI)† | FEV1 (ml) AM* (95% CI)† | FVC (ml) AM* (95% CI)† | ||
| *Arithmetic mean. | |||||||
| †95% confidence interval for the arithmetic mean. | |||||||
| Non-smokers | |||||||
| Engineers | 97 | 103 (100 to 106) | 105 (103 to 108) | 104 (102 to 107) | 106 (103 to 108) | −19 (−34 to 4.8) | −20 (−39 to −1.5) |
| Foremen | 39 | 99.6 (95.7 to 103) | 103 (98.8 to 107) | 100 (96.1 to 104) | 103 (99.2 to 106) | −26 (−59 to 6.4) | −20 (−55 to 14) |
| Outdoor concrete workers | 106 | 100 (97.9 to 103) | 103 (101 to 105) | 102 (99.3 to 104) | 103 (101 to 105) | −22 (−37 to 7.2) | −28 (−42 to −15) |
| Tunnel concrete workers | 27 | 96.6 (91.1 to 102) | 103 (98,4 to 108) | 94.0 (89.2 to 98.9) | 98.9 (94.7 to 103) | −16 (−86 to 54) | −40 (−89 to 8.1) |
| Drill and blast workers | 48 | 98.7 (95.3 to 102) | 102 (99.6 to 105) | 97.7 (94.0 to 101) | 102 (98.1 to 105) | −38 (−54 to −23) | −32 (−61 to −3.2) |
| Shotcreting operators | 10 | 104 (89.1 to 120) | 110 (96.2 to 123) | 98.3 (87.0 to 110) | 105 (94.6 to 116) | −180 (−430 to 77) | −200 (−550 to 140) |
| TBM workers | 2 | 112 (−1.49 to 225) | 108 (−47.7 to 263) | 113 (23.5 to 202) | 110 (25.0 to 195) | −22 (−270 to 230) | 9.6 (−800 to 820) |
| Ever smokers | |||||||
| Engineers | 58 | 96.9 (93.0 to 101) | 103 (99.6 to 106) | 101 (97.3 to 105) | 105 (101 to 108) | 3.1 (−25 to 31) | −12 (−36 to 13) |
| Foremen | 28 | 97.0 (90.9 to 103) | 104 (99.4 to 109) | 96.3 (89.6 to 103) | 102 (96.9 to 107) | −49 (−81 to −17) | −61 (−92 to −30) |
| Outdoor concrete workers | 114 | 99.1 (96.7 to 102) | 105 (102 to 107) | 99.2 (96.4 to 102) | 106 (103 to 108) | −23 (−42 to −3.2) | −6.9 (−29 to 15) |
| Tunnel concrete workers | 42 | 96.8 (92.1 to 102) | 104 (99.2 to 108) | 93.2 (87.1 to 99.4) | 102 (96.3 to 107) | −66 (−110 to −25) | −46 (−81 to −10) |
| Drill and blast workers | 67 | 96.7 (94.3 to 99.2) | 102 (100 to 104) | 92.1 (89.0 to 95.2) | 98.6 (95.8 to 101) | −56 (−76 to −35) | −53 (−73 to −33) |
| Shotcreting operators | 12 | 91.5 (83.0 to 99.7) | 98.5 (90.7 to 106) | 91.3 (81.6 to 101) | 98.6 (90.1 to 107) | −56 (−110 to 0.26) | −50 (−120 to 23) |
| TBM workers | 1 | 120 | 120 | 114 | 117 | −60 | −46 |