Table 5.
Percent change a in FVC associated with an interquartile-range increase in personal levels of PM 2.5 , elemental carbon (EC), or elemental components of PM 2.5 b, stratified by group
| Office workers (observations = 118) | Truck drivers (observations = 119) | |||||||
|---|---|---|---|---|---|---|---|---|
| IQR c | % change | (95% CI) | FDR d | IQR c | % change | (95% CI) | FDR d | |
| PM2.5 | 78.08 | 0.37 | (-1.60; 2.38) | 0.961 | 86.63 | -0.29 | (-4.18; 3.75) | 0.886 |
| EC | 5.86 | -0.49 | (-3.29; 2.39) | 0.961 | 8.26 | -1.93 | (-6.58; 2.94) | 0.541 |
| K | 0.55 | 2.00 | (0.04; 3.99) | 0.500 | 1.61 | -0.97 | (-8.79; 7.52) | 0.886 |
| S | 6.98 | -1.52 | (-5.26; 2.36) | 0.961 | 7.61 | 3.65 | (-3.01; 10.77) | 0.490 |
| Fe | 0.19 | 1.20 | (-0.56; 2.98) | 0.940 | 0.84 | -4.10 | (-8.48; 0.49) | 0.170 |
| Si | 0.58 | -0.18 | (-2.00; 1.68) | 0.961 | 2.73 | -8.14 | (-13.77; -2.14) | 0.058 |
| Al | 0.33 | -0.48 | (-3.17; 2.28) | 0.961 | 1.27 | -6.64 | (-11.53; -1.47) | 0.058 |
| Zn | 0.17 | 0.65 | (-1.12; 2.45) | 0.961 | 0.31 | 2.08 | (-2.49; 6.86) | 0.541 |
| Ca | 0.21 | -0.12 | (-2.43; 2.24) | 0.961 | 2.68 | -4.34 | (-7.83; -0.73) | 0.058 |
| Ti | 0.02 | 0.07 | (-2.61; 2.82) | 0.961 | 0.05 | -5.63 | (-10.07; -0.96) | 0.058 |
aAdjusted for age, sex, BMI, number of cigarettes smoked during examination time, day of the week, time spent commuting to work, work hours per week, temperature, and dew point values. For exposures other than PM2.5, PM2.5 was also adjusted.
bMeasured during the work hours of examination days using light-weight personal monitors.
cPercent changes and 95% confidence intervals are scaled to the interquartile range (IQR) of the exposures.
dFDR: Benjamini and Hochberg false discovery rate.