Volume 15, Number 3—March 2009
Dispatch
Sudden Increases in Listeriosis Rates in England and Wales, 2001 and 2003
Benjamin J. Cairns
and Robert J.H. Payne
and Robert J.H. PayneTable 2
Estimated coefficients for terms in the best fit model for the monthly incidence of listeriosis*†
| Variable | Coefficient | 95% Confidence interval | Unadjusted p value | Adjusted p value |
|---|---|---|---|---|
| (Intercept) | 1.5430 | 1.3961–1.6879 | <0.001 | <0.001 |
| GEAPR01 | 0.3424 | 0.1594–0.5243 | <0.001 | 0.001 |
| GEMAR03 | 0.3904 | 0.2462– 0.5373 | <0.001 | <0.001 |
| MEANTEMP | 0.0239 | 0.0055–0.0424 | 0.011 | 0.044 |
| MEANTEMP1 | 0.0401 | 0.0217–0.0586 | <0.001 | <0.001 |
| MONTHNUM | –0.0013 | –0.0027–0.0001 | 0.063 | 0.188 |
| ANOMALY1 | 0.0246 | –0.0246–0.0739 | 0.327 | 0.327 |
| ANOMALY1×GEAPR01 | 0.0556 | –0.0212–0.1323 | 0.156 | 0.312 |
| θ (theta) | 600.41 | NA | NA | NA |
*NA, not applicable.
†p values are for 2-sided tests of significance of the difference of each coefficient from zero; adjusted p values are according to Holm’s method (10). Percentage changes in the main text can be derived from these coefficients by taking exponentials, subtracting 1, and multiplying by 100.
