Table 3.
Adjusteda IRR of diarrhea according to prenatal exposure to p,p'-DDE and p,p'-DDT among boys from Tapachula, Chiapas, Mexico 2002–2005. Stratified on residence area
| Urban (n=448) | Rural (n=299) | ||
|---|---|---|---|
| Organochlorine (µg/g) |
IRR | IRR |
p- interaction |
| p,p'-DDE | 0.04 | ||
| ≤ 3.00 | 1.00 | 1.00 | |
| 3.01 – 6.00 | 1.12 (0.86, 1.46) | 1.01 (0.77, 1.31) | |
| 6.01 – 9.00 | 1.26 (0.83, 1.91) | 0.85 (0.62, 1.16) | |
| > 9.00 | 1.39 (1.07, 1.80) | 0.97 (0.74, 1.26) | |
| P-trend* | 0.01 | 0.73 | |
| p,p'-DDT | 0.08 | ||
| ≤ 0.25 | 1.00 | 1.00 | |
| 0.26 – 0.75 | 0.99 (0.78, 1.25) | 1.01 (0.78, 1.33) | |
| 0.76 – 1.99 | 0.95 (0.72, 1.26) | 0.81 (0.62, 1.06) | |
| ≥ 2.00 | 1.32 (0.95, 1.84) | 0.85 (0.63, 1.16) | |
| P-trend* | 0.13 | 0.27 |
IRR, incidence rate ratio
a
Adjusted for mother's age at delivery, parity, 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