Table 3.
Linear predictors of blood BTEX levels among participants classified as nonsmokers with blood 2,5-dimethylfuran < 0.014 ng/mL (n=423)
| Benzene (n=418) |
Toluene (n=421) |
Ethylbenzene (n=294) |
o-Xylene (n=406) |
m-/p-Xylene (n=422) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Adj. R-squared | 0.09 | 0.05 | 0.05 | 0.05 | 0.05 | |||||
| Predictor | N | β (95% CI) | N | β (95% CI) | N | β (95% CI) | N | β (95% CI) | N | β (95% CI) |
| Sex | ||||||||||
| Women | 116 | −0.26 (−0.47, −0.04) | 118 | −0.24 (−0.40, −0.08) | 81 | −0.32 (−0.58, −0.06) | 113 | −0.32 (−0.50, −0.14) | 118 | −0.37 (−0.56, −0.17) |
| Men | 302 | Ref | 303 | Ref | 213 | Ref | 293 | Ref | 304 | Ref |
|
| ||||||||||
| Time away from home | ||||||||||
| ≥ 8 hours | 176 | −0.33 (−0.52, −0.13) | 177 | −0.06 (−0.21, 0.08) | 117 | −0.01 (−0.25, 0.23) | 170 | −0.05 (−0.21, 0.12) | 176 | −0.06 (−0.24, 0.12) |
| < 8 hours | 242 | Ref | 244 | Ref | 177 | Ref | 236 | Ref | 246 | Ref |
|
| ||||||||||
| Required support | ||||||||||
| Yes | 110 | 0.21 (−0.01, 0.43) | 111 | −0.01 (−0.17, 0.15) | 79 | 0.01 (−0.25, 0.28) | 111 | 0.02 (−0.17, 0.20) | 112 | 0.05 (−0.15, 0.25) |
| No | 308 | Ref | 310 | Ref | 215 | Ref | 295 | Ref | 310 | Ref |
|
| ||||||||||
| Lived near waste site | ||||||||||
| Yes | 6 | 0.86 (0.04, 1.68) | 6 | 0.09 (−0.52, 0.71) | 4 | 0.32 (−0.70, 1.34) | 6 | −0.13 (−0.82, 0.55) | 6 | −0.19 (−0.94, 0.56) |
| No | 412 | Ref | 415 | Ref | 290 | Ref | 400 | Ref | 416 | Ref |
|
| ||||||||||
| Season | ||||||||||
| Fall/Winter | 373 | −0.60 (−0.91, −0.29) | 374 | −0.08 (−0.31, 0.15) | 270 | −0.29 (−0.72, 0.14) | 359 | −0.02 (−0.27, 0.24) | 375 | 0.25 (−0.03, 0.53) |
| Spring/Summer | 45 | Ref | 47 | Ref | 24 | Ref | 47 | Ref | 47 | Ref |
|
| ||||||||||
| Smoky/chemical smells | ||||||||||
| Yes | 8 | 0.72 (0.02, 1.43) | 8 | 1.16 (0.63, 1.69) | 6 | 1.65 (0.82, 2.48) | 8 | 1.19 (0.60, 1.78) | 8 | 1.10 (0.46, 1.75) |
| No | 410 | Ref | 413 | Ref | 288 | Ref | 398 | Ref | 414 | Ref |
|
| ||||||||||
| Home construction | ||||||||||
| Yes | 29 | 0.34 (−0.04, 0.73) | 29 | 0.13 (−0.15, 0.42) | 20 | −0.21 (−0.68, 0.26) | 28 | 0.04 (−0.29, 0.36) | 29 | 0.05 (−0.30, 0.40) |
| No | 389 | Ref | 392 | Ref | 274 | Ref | 378 | Ref | 393 | Ref |
β, regression coefficient associated with change in log BTEX; 95% CI, 95% confidence interval for regression coefficient; units in log ng/mL. Time away from home, hours spent outside the home in the past 24 hours; Required support, reported receiving financial or material support in the past year; Lived near waste site, reported living within ½ mile of Superfund or hazardous waste sites since 2012; Season, season of blood collection; Smoky/chemical smells, smelled smoke or any unusual chemical smells in or around the home in the past 24 hours; Home construction, reported any new construction to the home in the past six months.