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. Author manuscript; available in PMC: 2016 Dec 5.
Published in final edited form as: J Occup Environ Med. 2014 May;56(5):465–471. doi: 10.1097/JOM.0000000000000142

TABLE 3.

Effects of 8-Hour TWA THC and Naphthalene Concentrations in Air*

Predictor Postshift Urinary Concentration β (SE) P
THC, mg/m3 1-Naphthol 0.17 (0.04) <0.0001
2-Naphthol 0.09 (0.03) 0.005
2-Hydroxyfluorene 0.08 (0.03) 0.006
3-Hydroxyfluorene 0.04 (0.03) 0.23
9-Hydroxyfluorene 0.02 (0.03) 0.60
1-Hydroxyphenanthrene −0.04 (0.03) 0.20
2-Hydroxyphenanthrene 0.008 (0.03) 0.75
3-Hydroxyphenanthrene −0.01 (0.03) 0.64
4-Hydroxyphenanthrene −0.02 (0.03) 0.52
1-Hydroxypyrene −0.03 (0.03) 0.38
Naphthalene, μg/m3 1-Naphthol 0.22 (0.04) <0.0001
2-Naphthol 0.11 (0.03) 0.0006
*

Adjusted for preshift urinary concentrations, base, sex, cigarettes per shift, and postshift urinary creatinine; 8-hour TWA THC air concentrations, 8-hour TWA naphthalene air concentrations, and urinary metabolite concentrations are natural log-transformed.

SE, standard error; THC, total hydrocarbon; TWA, time-weighted average.