Table 3. The factors correlating with the hazard index (HI) of workers’ exposure to BTEX at gasoline stations (N = 47).
| Parameters | HI of BTEX | p-value | |
|---|---|---|---|
| HI≤1, n(%) | HI>1, n(%) | ||
| Location of gasoline station | 0.06 | ||
| Rural (n = 4) | 4(100.0) | 0 | |
| Suburban (n = 38) | 34(89.5) | 4(10.5) | |
| Urban (n = 5) | 4(80.0) | 1(20.0) | |
| Daily gasoline sold (liters) | 0.02* | ||
| <3,000 (n = 23) | 23(100.0) | 0 | |
| ≥3,000 (n = 24) | 19(79.2) | 5(20.8) | |
| Service-zone type of station | 0.16 | ||
| Type I+II (n = 12) | 12(100.0) | 0 | |
| Type III+IV (n = 35) | 30(85.2) | 5(14.3) | |
| Number of gasoline dispensers | 0.05* | ||
| <12 (n = 19) | 19(100.0) | 0 | |
| ≥12 (n = 28) | 23(82.1) | 5(17.9) | |
| Number of fuel nozzles | 0.20 | ||
| <12 (n = 8) | 8(100.0) | 0 | |
| ≥12 (n = 39) | 34(87.2) | 5(12.8) | |
| VOC concentration (ppm) | 0.47 | ||
| <200 (n = 4) | 4(100.0) | 0 | |
| ≥200 (n = 43) | 26(88.4) | 4(11.7) | |
*Significant at p-value ≤ 0.05