TABLE 1.
Negative binomial regression for respiratory infections and/or fever/influenza-like illness (RESP/ILI) emergency department (ED) visits from all age groups
| Isolate | Pearson χ2,* | n | B† | P |
|---|---|---|---|---|
| Rhinovirus | 334.5 | 216 | 0.001 | 0.001 |
| Influenza A | 332.5 | 216 | 0.004 | <0.001 |
| Parainfluenza | NV | NV | NV | NV |
| Influenza B | 302.6 | 216 | 0.005 | <0.001 |
| Adenovirus | NV | NV | NV | NV |
| RSV | 258.7 | 216 | 0.004 | <0.001 |
| pH1N1 | 67.3 | 43 | 0.003 | <0.001 |
| Isolate groups | ||||
| All influenza | 367.6 | 216 | 0.004 | <0.001 |
| Influenza + RSV | 295.1 | 216 | 0.005 | <0.001 |
| All viruses | 205.0 | 216 | 0.003 | <0.001 |
*
Pearson χ2 values can be used to determine the relative weight each isolate or group of isolates has on the model. A lower χ2 means a stronger fit of the model comparing ED RESP/ILI visits with laboratory cases;
†
The negative bionomial test statistic B can be used to determine the rise in laboratory cases for each additional ED RESP/ILI visit. For example, for each additional RESP/ILI visit, there was a 0.5% increase in laboratory cases for influenza B. NV (not valid) represents nonsignificant model results; pH1N1 Pandemic H1N1; RSV Respiratory syncytial virus