Table 1.
Demographics of 106 non-CBPs and 82 CBPs
| Variable | Non-CBP | CBP | P value |
|---|---|---|---|
| n | 106 | 82 | |
| Age (y, M ± SD) | 44.2 ± 5.8 | 45.7 ± 5.3 | 0.065a |
| Sex (Male, %) | 100 | 100 | |
| Race (Han Chinese, %) | 100 | 100 | |
| Current smokers (n, %) | 69, 65.1 | 57, 69.5 | 0.52b |
| Packyears (Mdn, Q1-Q3)d | 13.5 (6.0–25) | 10 (8–20) | 0.34c |
| Overweight or obesity (n, %) | 52, 49.1 | 33, 40.2 | 0.23b |
| Urinary OH-PAHs (μg/g cr, Mdn, Q1-Q3)e | 6.34 (2.97–10.92) | 4.95 (3.22–7.76) | 0.35c |
| PM2.5 (μg/m3, M ± SD, n) | 71.0 ± 11.4, 5 | 800.0 ± 574.5, 16 | |
| EC (μg/m3, M ± SD, n) | 4.0 ± 0.2, 5 | 657.0 ± 73.7, 16 | |
| Total RNA (μg, Mdn, Q1-Q3) | 0.82 (0.47–1.62) | 0.75 (0.44–1.69) | 0.65c |
CBP Carbon black packer, Q Quartile, M Mean, Mdn Median, PM Particulate matter, EC Elemental carbon, SD Standard deviation
aStudent t test
bChi square test
c Wilcoxon Rank sum test
dValues in current smokers
eUrinary OH-PAHs were the sum of 1-hydroxynaphthalene, 2-hydroxynaphthalene, 2-hydroxyfluorene, 2-hydroxyphenanthrene, 9-hydroxyphenanthrene, and 1-hydroxypyrene in urine