Table 4.
Percent difference (95% CI) in leukocyte telomere length by TEQDL and TEQ PCBs exposure, National Health and Nutrition Examination Survey, 1999–2002⁎.
| TEQDL | N = 1976 |
| Q1 ≤ 3.61 | Referent |
| Q2 3.62–6.17 | 4.08 (− 1.00–9.42) |
| Q3 6.18–9.94 | 5.13 (− 1.00–10.52) |
| Q4 > 9.94 | 11.63 (4.08–18.53) |
| p trend | 0.01 |
| R-square | 0.206 |
| TEQPCBs | N = 2202 |
| Q1 ≤ 1.33 | Referent |
| Q2 1.34–2.59 | − 1.00 (− 4.88–3.05) |
| Q3 2.60–4.47 | 4.08 (− 0.50–8.33) |
| Q4 > 4.47 | 6.18 (1.01–11.63) |
| p trend | 0.01 |
| R-square | 0.191 |
⁎
Adjusted for age (years, continuous), age squared, education (less than high-school, high school graduate, some college and above), race/ethnicity (non-Hispanic white, non-Hispanic black, Mexican American, multiracial, or other), alcohol consumption, self-reported smoking status (current, former, or never smoker), serum cotinine (natural log-transformed),BMI and sex.