Table 5. Percent differences (95% CI) in serum TT by quartiles of blood mercury exposure, NHANES, 2011–2012using weighted regression models.
| Blood mercury(μg/L) | Model 1a | Model2b |
|---|---|---|
| Male children(N = 431) | ||
| ≤0.20 (n = 112) | Reference | Reference |
| 0.20–0.34 (n = 105) | 2.45 (-20.36,31.79) | 5.49 (-17.59,35.03) |
| 0.34–0.59 (n = 111) | 15.02 (-10.17,47.28) | 10.29 (-13.62,40.82) |
| >0.59 (n = 103) | 4.92 (-21.02,39.40) | 0.67 (-24.36,33.99) |
| Adjusted p-trend | 0.46 | 0.75 |
| Male adolescents(N = 493) | ||
| ≤0.23 (n = 125) | Reference | Reference |
| 0.23–0.43 (n = 123) | 18.47 (-3.05,44.76) | 13.75 (-6.45,38.32) |
| 0.43–0.79 (n = 123) | -10.63 (-28.14,11.14) | -8.68 (-26.14,12.91) |
| >0.79 (n = 122) | 21.77 (-2.77,52.5) | 19.28 (-4.21,48.55) |
| Adjustedp-trend | 0.46 | 0.70 |
| Female children(N = 426) | ||
| ≤0.22(n = 114) | Reference | Reference |
| 0.22–0.36 (n = 103) | 6.76 (-10.22,26.94) | 8.62 (-9.17,29.89) |
| 0.36–0.66 (n = 106) | 0.89 (-15.07,19.83) | 0.7 (-15.56,20.09) |
| >0.66 (n = 103) | 29.78 (7.96,56.00) | 29.15 (6.9,56.02) |
| Adjustedp-trend | 0.10 | 0.14 |
| Female adolescent(N = 470) | ||
| ≤0.26 (n = 120) | Reference | Reference |
| 0.26–0.49 (n = 118) | -4.72 (-14.67,6.39) | -2.75 (-13.25,9.03) |
| 0.49–0.83 (n = 116) | -2.45 (-13.49,10.00) | 0.05 (-11.56,13.17) |
| >0.83 (n = 116) | -8.28 (-19.6,4.64) | -5.84 (-17.78,7.83) |
| Adjustedp-trendc | 0.46 | 0.70 |
a Adjusted for age (continuous), BMI(normal/underweight, overweight, and obese)and race-ethnicity(Non-Hispanic
White, Non-Hispanic black, Hispanic and other).
b Adjusted for variables in model 1 plus serum cotinine (log-transformed, continuous), time of venipuncture (morning, afternoon and evening), season of collection(1 November through 30 April, 1 May through 31 October), ratio family income to poverty (continuous).
c Adjusted p-trend:p-values adjusted for multiple testing.