Table 2.
Adjusted GM concentrations (95% CIs) of 2,4-DCP and 2,5-DCP (μg/L) according to age, NHANES cycle, and race/ethnicity × family income, NHANES 2003–2010.
Variable | Sample size (n) | 2,5-DCP adjusted GM (95% CI) | 2,4-DCP adjusted GM (95% CI) |
---|---|---|---|
Age group (years) | |||
6–11 | 1,474 | 10.57 (8.93, 12.52) | 1.12 (1.08, 1.16) |
12–19 | 2,245 | 7.79 (6.59, 9.19) | 0.88 (0.84, 0.91) |
20–59 | 4,480 | 8.32 (7.44, 9.31) | 0.88 (0.85, 0.90) |
> 60 | 2,227 | 10.91 (9.34, 12.74) | 1.06 (1.02, 1.10) |
NHANES cycle | |||
2003–2004 | 2,525 | 12.27 (10.10, 14.9) | 1.01 (0.94, 1.07) |
2005–2006 | 2,548 | 9.5 (7.12, 12.69) | 0.95 (0.90, 1.010) |
2007–2008 | 2,604 | 8.71 (7.17, 10.58) | 0.97 (0.92, 1.01) |
2009–2010 | 2,749 | 6.07 (5.05, 7.30) | 0.80 (0.77, 0.84) |
Race/ethnicity by family incomea | |||
Mexican American: below poverty | 748 | 31.95 (22.54, 45.30) | 1.95 (1.86, 2.04) |
Mexican American: low | 695 | 23.02 (16.60, 31.91) | 1.69 (1.61, 1.77) |
Mexican American: middle | 467 | 18.83 (12.87, 27.56) | 1.40 (1.30, 1.50) |
Mexican American: high | 235 | 9.28 (6.12, 14.08) | 0.95 (0.83, 1.07) |
Non-Hispanic white: below poverty | 607 | 7.98 (6.37, 10.00) | 0.86 (0.80, 0.92) |
Non-Hispanic white: low | 935 | 6.71 (5.49, 8.20) | 0.74 (0.69, 0.79) |
Non-Hispanic white: middle | 1,078 | 6.47 (5.38, 7.80) | 0.80 (0.77, 0.84) |
Non-Hispanic white: high | 1,551 | 6.21 (5.46, 7.06) | 0.79 (0.75, 0.82) |
Non-Hispanic black: below poverty | 653 | 26.02 (19.81, 34.16) | 1.53 (1.44, 1.62) |
Non-Hispanic black: low | 612 | 31.56 (23.39, 42.57) | 1.83 (1.74, 1.92) |
Non-Hispanic black: middle | 577 | 26.55 (20.82, 33.87) | 1.69 (1.62, 1.76) |
Non-Hispanic black: high | 435 | 20.70 (15.95, 26.88) | 1.27 (1.18, 1.36) |
Adjusted GMs were estimated using the regression equation with the intercept and regression coefficient for a given level of the categorical variable specified, and multiplying the β coefficient for all other categorical covariates by their estimated weighted percentage distribution. aBelow poverty, PIR < 1; low, PIR = 1–1.93; middle, PIR = 1.93–3.71; high, PIR > 3.71. |