Table 2

Bivariate analyses of the effects of selected demographic, lifestyle, and occupational variables on blood and air styrene concentrations

Blood styrene, mean (SEM), mg/lp value*Air styrene, mean (SEM), ppmp value*
*Independent samples t test for dichotomous comparisons, one way analysis of variance for multi-group comparisons, Pearson correlation for comparison of two continuous variables.
†African American, Asian, and American Indian.
‡Weight in kg divided by height in m2.
GenderMale0.27 (0.02)0.02920.5 (1.6)0.031
Female0.13 (0.02)11.5 (2.0)
IndustryBathtub0.21 (0.08)0.01919.4 (7.5)<0.001
Boat build0.21 (0.03)14.0 (1.9)
Pipe, tank0.21 (0.05)16.5 (2.0)
Truck, RV0.33 (0.04)27.3 (2.9)
Boat repair0.09 (0.02)9.2 (1.4)
Respirator useNo0.23 (0.02)0.08815.9 (1.3)0.001
Yes0.33 (0.05)32.6 (4.6)
Glove useNo0.20 (0.03)0.00915.8 (1.8)0.003
Yes0.32 (0.03)24.5 (2.4)
Working in a confined spaceNo0.22 (0.03)0.15216.1 (1.5)0.002
Yes0.29 (0.04)25.2 (3.0)
Recreational drug useNo0.20 (0.05)0.35016.0 (2.4)0.335
Yes0.26 (0.02)19.8 (1.6)
Non-prescription drug useNo0.23 (0.03)0.45318.7 (2.4)0.745
Yes0.26 (0.03)19.6 (1.8)
Prescription drug useNo0.16 (0.04)0.02013.4 (2.3)0.007
Yes0.28 (0.03)21.1 (1.7)
Styrofoam food or drink containersNo0.25 (0.03)0.88821.1 (2.4)0.310
Yes0.25 (0.03)18.1 (1.8)
Current no. of cigarettes per day<10.25 (0.03)0.68919.1 (1.9)0.131
1–100.26 (0.06)24.2 (4.6)
11–200.21 (0.04)13.6 (2.1)
>200.32 (0.12)24.5 (6.3)
Current no. of alcoholic beverages per week<10.21 (0.03)0.27214.4 (1.6)0.003
1–70.31 (0.04)23.9 (3.0)
8–210.25 (0.06)20.8 (3.4)
>210.23 (0.11)38.3 (12.1)
EthnicityCaucasian0.20 (0.02)0.00715.2 (1.4)<0.001
Hispanic0.34 (0.05)27.2 (3.4)
Other†0.37 (0.11)30.5 (9.1)
SeasonDec–Feb0.38 (0.05)0.01633.8 (4.2)<0.001
Mar–May0.20 (0.07)12.2 (3.1)
June–Aug0.24 (0.03)15.8 (1.7)
Sep–Nov0.19 (0.03)14.4 (1.9)
Time of day21:00–4:590.52 (0.12)0.00145.3 (8.2)<0.001
13:00–16:590.23 (0.02)17.2 (1.3)
17:00–20:590.15 (0.04)11.0 (2.8)
Correlation coefficient Correlation coefficient
Age−0.227<0.001−0.291<0.001
Body mass index‡0.0540.379−0.0070.911
Income−0.1080.079−0.1630.006
Air acetone0.250<0.0010.349<0.001