Table I.
Demographic and exposure characteristics of study subjects from Tianjin, China
| Benzene exposure | Subject (n) | Exposure levela (p.p.m.) | Age (year) | Gender |
Current smoking |
Current drinking alcohol |
Recent respiratory infections |
||||
| Male | Female | Yes | No | Yes | No | Yes | No | ||||
| Controls | 27 | 0.035 | 31.7 | 12 (44)b | 15 (56) | 10 (37) | 17 (63) | 7 (26) | 20 (74) | 3 (11) | 24 (89) |
| <10 p.p.m. | 22 | 4.95 ± 3.61 | 35.32 | 5 (23) | 17 (77) | 2 (9) | 20 (91) | 3 (14) | 19 (86) | 5 (23) | 17 (77) |
| ≥10 p.p.m. | 25 | 28.33 ± 20.09 | 35.24 | 9 (36) | 16 (64) | 7 (28) | 18 (72) | 9 (36) | 16 (64) | 2 (8) | 23 (92) |
a
Mean ± SD values.
b
No. of subjects (%).