Table 1.
ICD-9-CM–Coded Hospitalization Rates for Influenza, Respiratory Syncytial Virus, and Respiratory and Circulatory Diagnoses
| Influenzaa (Any Listed) by Age Group, y | RSVb (Any Listed) by Age Group, y | Respiratory and Circulatoryc (Primary) by Age Group, y | ||||||||||||||||
| Season | <1 | 1–4 | 5–49 | 50–64 | ≥65 | All Ages | <1 | 1–4 | 5–49 | 50–64 | ≥65 | All Ages | <1 | 1–4 | 5–49 | 50–64 | ≥65 | All Ages |
| 1993–1994 | 50.6 | 10.2 | 5.9 | 14.5 | 49.6 | 13.3 | 1720.8 | 136.6 | 1.6 | 0.6 | 2.1 | 37.2 | 5468 | 1448 | 734 | 4362 | 13 496 | 2862 |
| 1994–1995 | 24.5 | 5.8 | 3.8 | 7.3 | 21.1 | 6.8 | 1347.8 | 129.0 | 1.2 | 0.3 | 0.8 | 29.7 | 5098 | 1326 | 722 | 4330 | 13 642 | 2862 |
| 1995–1996 | 43.9 | 9.0 | 4.8 | 7.7 | 23.3 | 8.3 | 1997.2 | 182.9 | 1.8 | 0.9 | 1.1 | 42.7 | 5829 | 1402 | 705 | 4328 | 13 809 | 2892 |
| 1996–1997 | 54.7 | 11.1 | 5.3 | 10.7 | 37.8 | 11.1 | 1534.1 | 98.1 | 0.8 | 0.2 | 0.5 | 29.0 | 4920 | 1241 | 685 | 4323 | 14 420 | 2936 |
| 1997–1998 | 73.9 | 17.3 | 5.1 | 11.7 | 50.9 | 13.3 | 1902.1 | 117.6 | 1.0 | 0.4 | 0.7 | 35.1 | 5240 | 1348 | 676 | 4246 | 14 675 | 2971 |
| 1998–1999 | 65.1 | 14.2 | 5.1 | 13.3 | 50.7 | 13.2 | 2019.5 | 139.7 | 1.0 | 0.4 | 0.9 | 37.7 | 5365 | 1307 | 687 | 4291 | 15 117 | 3044 |
| 1999–2000 | 83.3 | 17.6 | 7.1 | 22.9 | 92.7 | 21.3 | 2085.7 | 133.5 | 1.0 | 0.4 | 1.0 | 37.6 | 5223 | 1308 | 655 | 4043 | 14 775 | 2932 |
| 2000–2001 | 51.5 | 12.3 | 3.9 | 5.3 | 13.9 | 6.4 | 1955.5 | 137.3 | 0.8 | 0.4 | 1.2 | 35.8 | 4972 | 1296 | 657 | 3957 | 14 744 | 2903 |
| 2001–2002 | 79.5 | 22.9 | 3.7 | 6.5 | 26.4 | 8.9 | 1894.9 | 136.4 | 0.8 | 0.6 | 1.0 | 35.0 | 4719 | 1267 | 632 | 3781 | 14 285 | 2808 |
| 2002–2003 | 55.9 | 14.3 | 2.8 | 3.6 | 10.0 | 5.2 | 1792.5 | 122.3 | 0.6 | 0.5 | 1.1 | 32.5 | 4554 | 1261 | 644 | 3715 | 13 825 | 2760 |
| 2003–2004 | 278.6 | 83.8 | 9.3 | 18.7 | 95.1 | 28.8 | 1751.9 | 136.9 | 0.7 | 0.6 | 1.0 | 32.9 | 4685 | 1336 | 669 | 3789 | 14 363 | 2872 |
| 2004–2005 | 106.5 | 25.2 | 5.9 | 16.4 | 87.9 | 19.8 | 1562.0 | 121.5 | 0.7 | 0.6 | 0.9 | 29.3 | 4093 | 1194 | 654 | 3693 | 13 958 | 2800 |
| 2005–2006 | 135.8 | 27.0 | 5.1 | 10.6 | 55.6 | 15.0 | 1631.4 | 121.6 | 0.8 | 0.8 | 1.9 | 30.4 | 3962 | 1150 | 624 | 3437 | 12 880 | 2624 |
| 2006–2007 | 100.7 | 22.6 | 3.9 | 6.2 | 21.5 | 8.8 | 1534.9 | 115.9 | 0.7 | 0.7 | 1.4 | 28.9 | 3620 | 991 | 535 | 3201 | 12 009 | 2440 |
| 2007–2008 | 167.5 | 34.7 | 8.1 | 18.4 | 84.3 | 22.9 | 1680.2 | 140.7 | 1.1 | 1.2 | 3.2 | 33.2 | 3838 | 1101 | 555 | 3250 | 12 192 | 2520 |
| Mean | 91.5 | 21.9 | 5.3 | 11.6 | 48.1 | 13.5 | 1760.7 | 131.3 | 1.0 | 0.6 | 1.2 | 33.8 | 4772 | 1265 | 656 | 3916 | 13 879 | 2815 |
Abbreviations: ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification; RSV, respiratory syncytial virus.
Data are hospitalization rates per 100 000 person-years and represent summaries from 13 states (Arizona, California, Colorado, Iowa, Illinois, Kansas, Massachusetts, Maryland, New Jersey, Oregon, South Carolina, Washington, and Wisconsin) .
a
ICD-9-CM codes 487.*.
b
Including codes ICD-9-CM 466.11 for bronchiolitis RSV, ICD-9-CM 480.1 for pneumonia RSV, and ICD-9-CM 079.6 for other RSV diagnosis.
c
ICD-9-CM codes 390–519.