Table 1.
GMs and selected percentiles (95% CIs) of urinary concentrations (μg/L), and detection frequency of 2,4-DCP and 2,5-DCP in the U.S. population ≥ 6 years of age, NHANES 2003–2010.
| Variable | NHANES 2003–2004 | NHANES 2005–2006 | NHANES 2007–2008 | NHANES 2009–2010 |
|---|---|---|---|---|
| 2,5-DCP | ||||
| GM | 12.90 (10.10, 16.30) | 9.55 (6.67, 13.70) | 9.04 (7.22, 11.30) | 6.10 (4.94, 7.53) |
| 50th percentile | 10.50 (8.00, 14.20) | 8.10 (5.60, 11.50) | 6.60 (5.50, 8.30) | 4.70 (3.70, 5.90) |
| 95th percentile | 705 (342,1,330) | 332 (175, 794) | 473 (296, 753) | 301 (168, 618) |
| Frequency of detection (%) | 98.2 | 98.2 | 98.3 | 97.4 |
| 2,4-DCP | ||||
| GM | 1.04 (0.90, 1.21) | 0.95 (0.79, 1.13) | 0.97 (0.85, 1.11) | 0.80 (0.73, 0.89) |
| 50th percentile | 0.90 (0.80, 1.10) | 0.80 (0.70, 1.00) | 0.80 (0.70, 0.90) | 0.70 (0.70, 0.80) |
| 95th percentile | 21.30 (14.10, 29.50) | 11.9 (7.00, 20.40) | 12.60 (9.00, 18.10) | 8.80 (6.40, 15.70) |
| Frequency of detection (%) | 81.2 | 87.5 | 90.5 | 85.9 |
| n = 2,525 for NHANES 2003–2004, 2,548 for 2005–2006, 2,604 for 2007–2008, and 2,749 for 2009–2010. | ||||