Table 3.
Estimated Influenza- and Respiratory Syncytial Virus-Associated Hospitalization Rates by Negative Binomial Regression Models
| Aged <1 y | Aged 1–4 y | Aged 5–49 y | Aged 50–64 y | Aged ≥65 y | All Agesa | |||||||
| Season | Influenza | RSV | Influenza | RSV | Influenza | RSV | Influenza | RSV | Influenza | RSV | Influenza | RSV |
| 1993–1994b | 92.3 | 2802.0 | 14.7 | 206.4 | 12.1 | 2.2 | 55.6 | 16.2 | 234.9 | 100.7 | 47.6 | 65.9 |
| 1994–1995b | 49.5 | 2121.3 | 16.8 | 181.3 | 12.5 | 1.8 | 49.8 | 14.4 | 203.0 | 88.0 | 42.5 | 53.1 |
| 1995–1996 | 191.2 | 3150.7 | 23.6 | 260.4 | 13.6 | 2.6 | 42.8 | 19.9 | 166.6 | 124.5 | 40.0 | 77.4 |
| 1996–1997b | 93.4 | 2227.7 | 38.5 | 150.1 | 20.8 | 1.4 | 84.3 | 14.6 | 369.8 | 93.0 | 75.6 | 53.3 |
| 1997–1998b | 128.1 | 2635.6 | 23.7 | 176.6 | 13.7 | 1.7 | 75.9 | 16.3 | 386.6 | 110.4 | 71.5 | 62.9 |
| 1998–1999b | 122.6 | 2645.2 | 34.8 | 191.7 | 19.6 | 1.6 | 85.4 | 14.7 | 397.9 | 102.9 | 78.7 | 62.6 |
| 1999–2000b | 118.9 | 2749.1 | 23.4 | 189.8 | 15.1 | 1.6 | 78.9 | 15.4 | 396.8 | 107.1 | 73.9 | 64.5 |
| 2000–2001 | 147.3 | 2484.6 | 46.3 | 184.9 | 18.0 | 1.4 | 44.4 | 12.6 | 162.1 | 89.5 | 43.2 | 57.9 |
| 2001–2002b | 129.2 | 2459.6 | 38.5 | 186.1 | 16.6 | 1.2 | 74.5 | 12.1 | 383.6 | 88.9 | 73.6 | 57.4 |
| 2002–2003 | 163.2 | 2222.6 | 40.3 | 163.8 | 16.0 | 1.1 | 41.6 | 11.0 | 164.6 | 77.1 | 41.6 | 51.2 |
| 2003–2004b | 318.0 | 2141.2 | 91.5 | 174.1 | 21.2 | 1.2 | 92.2 | 10.4 | 508.5 | 71.0 | 100.3 | 49.9 |
| 2004–2005b | 140.0 | 1866.3 | 52.1 | 153.2 | 22.5 | 1.2 | 89.7 | 9.5 | 452.9 | 63.3 | 89.3 | 43.9 |
| 2005–2006b | 171.3 | 1937.7 | 41.1 | 152.0 | 15.1 | 1.2 | 57.3 | 9.6 | 291.9 | 62.3 | 59.4 | 44.7 |
| 2006–2007 | 163.7 | 1817.2 | 32.7 | 139.5 | 10.7 | 1.1 | 30.4 | 7.8 | 136.9 | 58.6 | 32.6 | 41.6 |
| 2007–2008b | 236.8 | 1915.4 | 64.6 | 163.7 | 25.0 | 1.4 | 81.4 | 7.3 | 380.9 | 53.7 | 82.7 | 43.8 |
| Minimum | 49.5 | 1817.2 | 14.7 | 139.5 | 10.7 | 1.1 | 30.4 | 7.3 | 136.9 | 53.7 | 32.6 | 41.6 |
| Maximum | 318.0 | 3150.7 | 91.5 | 260.4 | 25.0 | 2.6 | 92.2 | 19.9 | 508.5 | 124.5 | 100.3 | 77.4 |
| Mean | 151.0 | 2345.1 | 38.8 | 178.2 | 16.8 | 1.5 | 65.6 | 12.8 | 309.1 | 86.1 | 63.5 | 55.3 |
| 95% CI | 105.3–659.6 | 2219.3–2524.7 | 24.1–213.2 | 155.3–230.1 | 9.8–58.4 | 1.0–12.3 | 35.0–270.0 | 2.4–73.9 | 186.0–1103.7 | 37.3–326.2 | 37.5–236.6 | 44.4–106.7 |
Abbreviations: CI, confidence interval; RSV, respiratory syncytial virus.
Data are hospitalization rates per 100 000 person-years and represent summaries from 13 state-based model estimates.
a
Standardized with 2000 census population figures for each age group.
b
Seasons in which ≥50% of all infection isolates were subtyped as influenza A(H3N2).