Table 5.
Effect of exposure on the percentage predicted lung function parameters
| Lung function parameter | Exposure | Unadjusted model β (95% CI) |
Adjusted model 1a β (95% CI) |
Adjusted model 2b β (95% CI) |
|---|---|---|---|---|
| VC, %-predicted | Office workers N = 140 | Baseline level | ||
| Hairdressers N = 140 | − 11.22 (− 14.82 to − 7.62) | − 10.61 (− 14.55 to − 6.66) | − 9.94 (− 14.15 to − 5.72) | |
| Work duration, per year | − 0.52 (− 0.77 to − 0.28) | − 0.42 (− 0.68 to − 0.15) | − 0.36 (− 0.63 to − 0.10) | |
| Work duration ≤ 6 years, N = 43 | − 7.96 (− 13.18 to − 2.74) | − 7.40 (− 12.87 to − 1.94) | − 6.97 (− 12.64 to − 1.31) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 13.74 (− 19.40 to − 8.08) | − 13.52 (− 19.26 to − 7.78) | − 12.72 (− 18.67 to − 6.76) | |
| Work duration > 10 and ≤ 15 years, N = 35 | − 14.97 (− 20.63 to − 9.32) | − 14.03 (− 20 to − 8.08) | − 13.57 (− 19.71 to − 7.42) | |
| Work duration > 15 years, N = 27 | − 8.27 (− 14.56 to − 1.97) | − 6.58 (− 13.28 to 0.11) | − 5.79 (− 12.60 to 1.03) | |
| FEV1, %-predicted | Office workers N = 140c | Baseline level | ||
| Hairdressers N = 140 | − 15.78 (− 19.85 to − 11.71) | − 14.38 (− 18.85 to − 9.91) | − 14.28 (− 19.07 to − 9.50) | |
| Work duration, per year | − 0.76 (− 1.04 to − 0.49) | − 0.62 (− 0.92 to − 0.32) | − 0.58 (− 0.88 to − 0.27) | |
| Work duration ≤ 6 years, N = 43 | − 12.13 (− 18.04 to − 6.22) | − 9.83 (− 16 to − 3.68) | − 9.91 (− 16.34 to − 3.49) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 18.42 (− 24.82 to − 12.02) | − 18.33 (− 24.81 to − 11.85) | − 18.19 (− 24.94 to − 11.45) | |
| Work duration > 10 and ≤ 15 years, N = 35 | − 19.76 (− 26.16 to − 13.36) | − 18.31 (− 25.03 to − 11.58) | − 18.37 (− 25.33 to − 11.41) | |
| Work duration > 15 years, N = 27 | − 13 (− 20.12 to − 5.88) | − 10.41 (− 17.97 to − 2.85) | − 10.20 (− 17.92 to − 2.47) | |
| FVC, %-predicted | Office workers N = 140 | Baseline level | ||
| Hairdressers N = 140 | − 16.73(− 20.49 to − 12.97) | − 15.39 (− 19.52 to − 11.27) | − 15.72 (− 20.15 to − 11.30) | |
| Work duration, per year | − 0.77 (− 1.02 to− 0.50) | − 0.61 (− 0.89 to − 0.32) | − 0.57 (− 0.86 to − 0.28) | |
| Work duration ≤ 6 years, N = 43 | − 13.41 (− 18.85 to − 7.98) | − 11.55 (− 17.23 to − 5.86) | − 12.02 (− 17.93 to − 6.10) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 18.03 (− 23.92 to − 12.14) | − 17.83 (− 23.80 to − 11.86) | − 18.20 (− 24.41 to − 11.98) | |
| Work duration > 10 and ≤ 15 years, N = 35 | − 22.28 (− 28.17 to − 16.39) | − 20.82 (− 27.01 to − 14.62) | − 21.28 (− 27.69 to − 14.87) | |
| Work duration > 15 years, N = 27 | − 13.11 (− 19.67 to − 6.56) | − 10.62 (− 17.58 to − 3.65) | − 10.85 (− 17.96 to − 3.73) | |
| FEV1: FVC, %-predicted | Office workers N = 140d | Baseline level | ||
| Hairdressers N = 140 | 0.25 (− 3.61 to 4.11) | 0.58 (− 3.69 to 4.85) | 0.84 (− 3.73 to 5.42) | |
| Work duration, per year | − 0.004 (− 0.25 to 0.24) | 0.007 (− 0.27 to 0.28) | 0.01 (− 0.26 to 0.30) | |
| Work duration ≤ 6 years, N = 43 | 0.20 (− 5.45 to 5.85) | 0.99 (− 4.97 to 6.97) | 1.15 (− 5.06 to 7.37) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 1.64 (− 7.77 to 4.48) | − 1.68 (− 7.95 to 4.58) | − 1.32 (− 7.85 to 5.20) | |
| Work duration > 10 and ≤ 15 years, N = 35 | 2.41 (− 3.71 to 8.54) | 2.76 (− 3.74 to 9.26) | 2.94 (− 3.79 to 9.67) | |
| Work duration > 15 years, N = 27 | − 0.04 (− 6.85 to 6.77) | 0.72 (− 6.59 to 8.04) | 1.09 (− 6.37 to 8.57) | |
The statistically significant effects are shown bolded
aAdjusted for weight, marital status, and education
bAdjusted for weight, marital status, education, smoking, and use of water pipe
cFEV1, %-predicted missing for one participant in the reference group
dFEV1: FVC, %-predicted missing for on participant in the reference group