Volume 10, Number 10—October 2004
Research
Egg Quality Assurance Programs and Egg-associated Salmonella Enteritidis Infections, United States
, Patricia M. Griffin*, Martin I. Meltzer*, Chris R. Braden*, and Robert V. Tauxe*
Table 4
Regression model estimated rates of change in Salmonella enterica serovar Enteriditis incidence associated with unit changes in related variablesa
| Explanatory variable | Unit of change | Change in S. Enteritidis rate (%) | p value |
|---|---|---|---|
| Interceptb | –120.65 | < 0.01 | |
| Eggs produced under EQAP (%) | 1 | –0.14 | < 0.05 |
| State population at high risk for S. Enteritidis (%)c | 1 | –8.15 | < 0.01 |
| State had a state-sponsored EQAPd | Yes | –72.25 | < 0.1 |
| State was affected by S. Enteritidis epidemice | Yes | –3.60 | |
| Successful S. Enteritidis outbreak traceback investigations by state per yearf | Numeral | 2.82 | < 0.01 |
| State was in the northeast region of the United Statesg | Yes | 12.36 |
aEQAP, egg quality assurance program.
bIntercept term is the baseline case, which represents no eggs produced under EQAPs, zero percent of the population at high risk for S. Enteritidis, no states affected by S. Enteritidis epidemic, no successful outbreak investigations, and all states outside of the northeast region.
cChildren <5 and seniors >65 years.
dNot industry-sponsored EQAP.
eA state affected by S. Enteritidis epidemic had an isolation rate >1/100,000 persons from 1980 to 1999.
fNumber of S. Enteritidis outbreak investigations from USDA S. Enteritidis Task Force status reports for 1990 to 1993.
gNortheast region includes Connecticut, Pennsylvania, and New York.