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Table 2 Differences of urinary 1-OH-PYR and 2-OH-PH in three occupational groupsa

From: Occupational exposure to asphalt mixture during road paving is related to increased mitochondria DNA copy number: a cross-sectional study

PAH metabolites

Occupational groups

Adjusted mean (95%CI)

β (95% CI)

p

ln(1-OH-PYR)

Conventional asphalt workers

−2.6 (− 2.8, − 2.4)

0.76 (0.54, 0.97)

< 0.001

CRM asphalt workers

−2.5 (− 2.8, − 2.3)

0.85 (0.58, 1.1)

< 0.001

Control

−3.4 (− 3.6, − 3.2)

0

ln(2-OH-PH)

Conventional asphalt workers

−1.6 (− 1.8, − 1.5)

0.58 (0.36, 0.79)

< 0.001

CRM asphalt workers

−1.6 (− 1.9, − 1.4)

0.58 (0.31, 0.85)

< 0.001

Control

−2.2 (− 2.4, − 2.0)

0

  1. aAdjusted mean, β estimates and p values were derived from linear mixed model after adjusting for age, BMI, smoking and snus status, cigarette pack-year and investigation season. The controls are the reference group