Table 4.
Effect of exposure on the absolute lung function parameters
| Lung function parameter | Exposure | Unadjusted model β (95% CI) |
Adjusted model 1a β (95% CI) |
Adjusted model 2b β (95% CI) |
Adjusted model 3c β (95% CI) |
|---|---|---|---|---|---|
| VC, L | Office workers N = 140 | Baseline level | |||
| Hairdressers N = 140 | − 0.45 (− 0.57 to − 0.32) | − 0.42 (− 0.53 to − 0.31) | − 0.38 (− 0.51 to − 0.26) | − 0.36 (− 0.49 to − 0.22) | |
| Work duration, per year | − 0.03 (− 0.04 to − 0.02) | − 0.03 (− 0.03 to − 0.02) | − 0.02 (− 0.03 to − 0.01) | − 0.021 (− 0.03 to − 0.01) | |
| Work duration ≤ 6 years, N = 43 | − 0.25 (− 0.43 to − 0.07) | − 0.26 (− 0.43 to − 0.088) | − 0.20 (− 0.39 to − 0.02) | − 0.12 (− 0.38 to 0.003) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 0.43 (− 0.62 to − 0.23) | − 0.47 (− 0.65 to − 0.29) | − 0.44 (− 0.62 to − 0.26) | − 0.41 (− 0.60 to − 0.22) | |
| Work duration > 10 and ≤ 15 years, N = 35 | − 0.62 (− 0.81 to − 0.43) | − 0.56 (− 0.74 to − 0.38) | − 0.52 (− 0.71 to − 0.34) | − 0.50 (− 0.70 to − 0.31) | |
| Work duration > 15 years, N = 27 | − 0.58 (− 0.79 to − 0.36) | − 0.42 (− 0.64 to − 0.21) | − 0.38 (− 0.60 to − 0.16) | − 0.35 (− 0.58 to − 0.12) | |
| FEV1, L | Office workers N = 140 | Baseline level | |||
| Hairdressers N = 140 | − 0.57 (− 0.69 to − 0.46) | − 0.55 (− 0.65 to − 0.45) | − 0.54 (− 0.65 to − 0.43) | − 0.53 (− 0.65 to − 0.42) | |
| Work duration, per year | − 0.03 (− 0.04 to − 0.03) | − 0.03 (− 0.04 to − 0.02) | − 0.03 (− 0.04 to − 0.023) | − 0.03 (− 0.04 to − 0.02) | |
| Work duration ≤ 6 years, N = 43 | − 0.38 (− 0.54 to − 0.22) | − 0.43 (− 0.58 to − 0.27) | − 0.37 (− 0.53 to − 0.21) | − 0.37 (− 0.54 to − 0.21) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 0.56 (− 0.73 to − 0.38) | − 0.61 (− 0.77 to − 0.45) | − 0.63 (− 0.78 to − 0.47) | − 0.62 (− 0.79 to − 0.46) | |
| Work duration > 10 and ≤ 15 years, N = 35 | − 0.72 (− 0.90 to − 0.55) | − 0.66 (− 0.82 to − 0.50) | − 0.66 (− 0.82 to − 0.50) | − 0.66 (− 0.83 to − 0.49) | |
| Work duration > 15 years, N = 27 | − 0.71 (− 0.90 to − 0.52) | − 0.52 (− 0.71 to − 0.33) | − 0.50 (− 0.02 to − 0.01) | − 0.50 (− 0.70 to − 0.30) | |
| FVC, L | Office workers N = 140 | Baseline level | |||
| Hairdressers N = 140 | − 0.68 (− 0.80 to − 0.56) | − 0.65 (− 0.75 to − 0.545) | − 0.63 (− 0.75 to − 0.51) | − 0.64 (− 0.76 to − 0.51) | |
| Work duration, per year | − 0.04 (− 0.05 to − 0.03) | − 0.04 (− 0.04 to− 0.03) | − 0.03 (− 0.04 to − 0.02) | − 0.03 (− 0.04 to − 0.02) | |
| Work duration ≤ 6 years, N = 43 | − 0.49 (− 0.66 to − 0.32) | − 0.51 (− 0.68 to − 0.35) | − 0.46 (− 0.63 to − 0.28) | − 0.47 (− 0.64 to − 0.29) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 0.60 (− 0.79 to − 0.41) | − 0.65 (− 0.82 to − 0.49) | − 0.66 (− 0.83 to − 0.49) | − 0.67 (− 0.85 to − 0.50) | |
| Work duration > 10 and ≤ 15 years, N = 35 | − 0.90 (− 1.09 to − 0.71) | − 0.83 (− 1 to − 0.67) | − 0.82 (− 1 to − 0.65) | − 0.84 (− 1.01 to − 0.66) | |
| Work duration > 15 years, N = 27 | − 0.80 (− 1.01 to − 0.59) | − 0.61 (− 0.81 to − 0.41) | − 0.59 (− 0.79 to − 0.38) | − 0.60 (− 0.81 to − 0.38) | |
| FEV1: FVC, % | Office workers N = 140 | Baseline level | |||
| Hairdressers N = 140 | 0.64 (− 1.79 to 3.06) | 0.55 (− 1.88 to 2.98) | 0.47 (− 2.23 to 3.17) | 0.85 (− 2.02 to 3.73) | |
| Work duration, per year | − 0.07 (− 0.23 to 0.08) | − 0.04 (− 0.21 to 0.11) | − 0.07 (− 0.25 to 0.12) | − 0.05 (− 0.24 to 0.14) | |
| Work duration ≤ 6 years, N = 43 | 2.01 (− 1.53 to 5.54) | 1.23 (− 2.54 to 5.01) | 1.54 (− 2.51 to 5.58) | 1.74 (− 2.41 to 5.90) | |
| Work duration > 6 and ≤ 10 years, N = 35 | − 0.83 (− 4.67 to 3.01) | − 1.17 (− 5.06 to 2.72) | − 1.37 (− 5.37 to 2.64) | − 0.89 (− 5.02 to 3.23) | |
| Work duration > 10 and ≤ 15 years, N = 35 | 1.98 (− 1.85 to 5.82) | 2.24 (− 1.64 to 6.12) | 2.12 (− 1.96 to 6.21) | 2.45 (− 1.77 to 6.68) | |
| Work duration > 15 years, N = 27 | − 1.38 (− 5.64 to 2.88) | − 0.46 (− 5.13 to 4.21) | − 0.49 (− 5.34 to 4.362) | 0.10 (− 4.87 to 5.07) | |
The statistically significant effects are shown bolded
aAdjusted for age and height
bAdjusted for age, height, weight, marital status, and education
cAdjusted for age, height, weight, marital status, education, smoking, and use of water pipe