Table 2.
IRR of diarrhea according to prenatal exposure to p,p'-DDE and p,p'-DDT among 747 boys from Tapachula, Chiapas, Mexico 2002–2005
| Organochlorine (µg/g) |
Unadjusted IRR | Adjusteda IRR |
|---|---|---|
| p,p'-DDE | ||
| ≤ 3.00 | 1.00 | 1.00 |
| 3.01 – 6.00 | 1.07 (0.89, 1.28) | 1.08 (0.90, 1.30) |
| 6.01 – 9.00 | 1.05 (0.82, 1.35) | 1.04 (0.80, 1.35) |
| > 9.00 | 1.16 (0.96, 1.40) | 1.14 (0.94, 1.39) |
| P-trend* | 0.13 | 0.23 |
| p,p'-DDT | ||
| ≤ 0.25 | 1.00 | 1.00 |
| 0.26 – 0.75 | 1.01 (0.85, 1.20) | 1.01 (0.85, 1.20) |
| 0.76 – 1.99 | 0.94 (0.78, 1.13) | 0.87 (0.71, 1.06) |
| ≥ 2.00 | 1.08 (0.86, 1.35) | 0.99 (0.78, 1.25) |
| P-trend* | 0.59 | 0.85 |
IRR, incidence rate ratio
a
Adjusted for mother's age at delivery, parity, area of residence, and poverty index
*
Trend tests from models ran with p,p'-DDE or p,p'-DDT as ordinal variables coded with median levels of each category