Table 4.

Negative binomial regression results for stroke, and comparison of Hudson River to "clean" zip codes.

Exposure	Rate Ratio	95% Confidence Interval
A. Ischemic Stroke
"POPs" zip codes	1.17	1.04	1.39
"Other waste" zip codes	1.14	1.01	1.28
"Clean" zip codes*	1.00	1.00	1.00
B. Hemorrhagic Stroke
"POPs" zip codes	1.10	0.99	1.22
"Other waste" zip codes	1.04	0.93	1.16
"Clean" zip codes*	1.00	1.00	1.00
C. Subset of Hudson River zip codes†
Hudson River zip codes	1.20	1.10	1.32
"Clean" zip codes*	1.00	1.00	1.00

* Zip codes with no identified hazardous waste sites (reference)

† Zip codes along the PCB-contaminated portion of the Hudson River