Table 3.
Influenza-Associated Hospitalization Rates for the American Indian and Alaska Native Persons and Comparison US Populations, IHS, and 13 State Inpatient Databases, 2001–2008*
| Yeara | Aged <1 y |
Aged 1–4 y |
Aged 5–49 y |
Aged 50–64 y |
Aged ≥65 y |
All Agesb |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AI/AN | US | AI/AN | US | AI/AN | US | AI/AN | US | AI/AN | US | AI/AN | US | |
| 2001-2002 | 913.4 | 155.4 | 170.6 | 28.3 | 20.4 | 14.2 | 126.1 | 61.0 | 356.2 | 284.3 | 98.3 | 57.5 |
| 2002-2003 | 1413.4 | 173.4 | 265.6 | 15.1 | 19.3 | 15.3 | 115.5 | 47.4 | 215.4 | 177.0 | 90.5 | 42.4 |
| 2003-2004 | 997.8 | 356.7 | 206.2 | 92.0 | 29.8 | 18.9 | 146.9 | 75.8 | 484.5 | 392.0 | 126.7 | 82.4 |
| 2004-2005 | 601.3 | 162.1 | 137.0 | 30.3 | 22.9 | 20.1 | 140.9 | 79.4 | 403.0 | 375.0 | 101.9 | 75.6 |
| 2005-2006 | 774.6 | 184.3 | 149.1 | 30.6 | 18.1 | 13.2 | 95.9 | 49.9 | 290.8 | 239.6 | 81.1 | 50.1 |
| 2006-2007 | 1510.5 | 190.5 | 276.7 | 23.3 | 14.8 | 8.9 | 61.0 | 26.0 | 168.1 | 102.8 | 75.4 | 26.4 |
| 2007-2008 | 1283.8 | 248.7 | 230.6 | 38.2 | 26.2 | 21.7 | 138.8 | 76.4 | 366.5 | 336.7 | 113.6 | 73.0 |
| Minimum | 601.3 | 155.4 | 137.0 | 15.1 | 14.8 | 8.9 | 61.0 | 26.0 | 168.1 | 102.8 | 75.4 | 26.4 |
| Maximum | 1510.5 | 356.7 | 276.7 | 92.0 | 29.8 | 21.7 | 146.9 | 79.4 | 484.5 | 392.0 | 126.7 | 82.4 |
| Mean | 1070.7 | 210.2 | 205.1 | 36.8 | 21.6 | 16.1 | 117.9 | 59.4 | 326.3 | 272.5 | 98.2 | 58.2 |
| 95% CI | 640.7–2969.5 | 153.5–478.5 | 112.9–627.9 | 32.9–187.2 | 10.8–72.8 | 9.3–49.0 | 52.8–432.9 | 30.9–196.4 | 175.3–1049.8 | 160.9–755.0 | 51.6–317.8 | 34.7–172.2 |
Abbreviations: AI/AN, American Indian/Alaska Native; CI, confidence interval; IHS, Indian Health Service.
a Respiratory year is July through June.
b Standardized with 2000 intercensal census population for each age group.
* Source: Indian Health Service. Direct/Contract Health Service inpatient data, fiscal years 2001–2011. Albuquerque, NM: Indian Health Service, 2012. Healthcare Cost and Utilization Project. Overview of the State Inpatient Databases. Available at: http://www.hcup-us.ahrq.gov/sidoverview.jsp. Accessed 1 April 2013. Data are rates of discharges per 100 000 persons of corresponding group. Statistically significant differences in mean influenza-associated hospitalization rates between AI/AN persons and comparison US populations are indicated in bold.