Volume 24, Number 12—December 2018
Synopsis
Restaurant Inspection Letter Grades and Salmonella Infections, New York, New York, USA
Melanie J. Firestone
and Craig W. Hedberg
and Craig W. Hedberg
Table 3
Regression for interrupted time series analysis of Salmonella infection rates, New York, NY, USA, and the rest of the state, 1994–2015*
| Predictor variables | IRR | Robust SE | 95% CI | p value |
|---|---|---|---|---|
| Year | 0.95 | 0.01 | 0.94–0.96 | <0.01 |
| Region | 1.50 | 0.08 | 1.35–1.68 | <0.01 |
| Region × year | 0.99 | 0.01 | 0.97–1.00 | 0.16 |
| Point scoring policy implementation | 1.20 | 0.06 | 1.08–1.32 | <0.01 |
| Trend after point scoring implementation | 1.04 | 0.01 | 1.02–1.07 | <0.01 |
| Region × point scoring implementation | 0.92 | 0.07 | 0.80–1.07 | 0.29 |
| Region × trend after points | 1.02 | 0.02 | 0.99–1.05 | 0.28 |
| Letter grade policy implementation | 1.01 | 0.04 | 0.93–1.10 | 0.81 |
| Trend after grading | 0.98 | 0.01 | 0.96–1.00 | 0.09 |
| Region × grading | 0.99 | 0.06 | 0.88–1.11 | 0.85 |
| Region × trend after grading | 0.95 | 0.02 | 0.92–0.98 | <0.01 |
| Intercept | 0.00 | 0.00 | 0.00–0.00 | <0.01 |
*IRR, incidence rate ratio.
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