Volume 15, Number 6—June 2009
Research
Case-based Surveillance of Influenza Hospitalizations during 2004–2008, Colorado, USA
Rosemary Proff, Ken Gershman
, Dennis Lezotte, and Ann-Christine Nyquist
, Dennis Lezotte, and Ann-Christine NyquistTable 3
Rates of influenza hospitalizations per 100,000 population, by age group, Colorado, USA, 2004–08
| Age group | Influenza season (October 1–May 31), no. cases/100,000 |
|||
|---|---|---|---|---|
| 2004–05 | 2005–06 | 2006–07 | 2007–08 | |
| <6 mo | 185.6 | 234.6 | 111.8 | 225.4 |
| 6–23 mo | 104.3 | 148.9 | 66.0 | 110.5 |
| 2–4 y | 27.9 | 28.4 | 12.8 | 30.3 |
| 5–17 y | 6.7 | 8.6 | 3.4 | 8.5 |
| 18–49 y | 6.2 | 3.8 | 3.4 | 7.8 |
| 50–64 y | 19.4 | 12.8 | 4.6 | 16.1 |
| 65–79 y | 59.4 | 49.0 | 15.9 | 49.5 |
| >80 y |
214.4 |
153.6 |
45.7 |
174.5 |
| Overall rate (all age groups) | 21.2 | 18.1 | 7.7 | 20.6 |
