Table 2. Predictors of clinical severity and receipt of antimicrobial medications among those with PCR-confirmed influenza infection.
| Total | % IPD | pa | % Oseltamivir | P | ||
|---|---|---|---|---|---|---|
| Overall | Inpatient | 55 | 3.7% | — | 25.4% | <0.001 |
| Outpatient | 1438 | — | 1.0% | |||
| Subtype | A(H3N2) | 392 | 4.1% | 3.6% | ||
| A(H1N1)pdm09 | 524 | 3.4% | 0.847 | 1.1% | 0.052 | |
| Flu B | 576 | 3.6% | 1.6% | |||
| Age (years) | 0–4 | 329 | 8.8% | 2.7% | ||
| 5–14 | 667 | 3.1% | <0.001 | 2.5% | 0.019 | |
| 15–60 | 467 | 0.9% | 0.4% | |||
| 60 + | 30 | 3.3% | 3.3% | |||
| Gender | Female | 658 | 4.4% | 0.238 | 1.8% | 0.917 |
| Male | 835 | 3.1% | 2.0% | |||
| # Comorbid | None | 1369 | 3.2% | 1.9% | ||
| conditions | 1 | 123 | 8.9% | 0.005 | 2.4% | 0.755 |
| 2 | 1 | 0.0% | 0.0% | |||
| Occupation | Healthcare | 70 | 0% | 0% | ||
| Homemaker | 33 | 0% | 0.052 | 0% | 0.171 | |
| Military | 104 | 0% | 0% | |||
| Office | 130 | 0% | 0% | |||
| University | 38 | 3.3% | 1.7% | |||
| Year | 2009 | 46 | 4.3% | 2.2% | ||
| 2010 | 579 | 5.5% | 0.010 | 1.2% | 0.092 | |
| 2011 | 218 | 1.8% | 2.3% | |||
| 2012 | 285 | 0.7% | 1.4% | |||
| 2013 | 109 | 3.7% | 5.5% | |||
| 2014 | 256 | 4.3% | 2.3% |
a P-values were calculated using Mantel-Haenszel χ2 statistics, comparing numbers of individuals recruited in inpatient or outpatient departments, or with and without a history of oseltamivir, across strata for each variable of interest. Exact testing was performed for comparisons with cells with values < = 5. Comparisons that were statistically significantly with α = 0.05 are shown in bold.