Table 1. Demographics of community cohort of adults ≥50 years old and RSV infected patients for all seasons combined (2006–07 to 2009–10).
| RSV Cases | Community Cohort | |
| (n = 164) | (n = 20,453)1 | |
| Age at enrollment in years (mean ± sd) [median] | 64.2 (10.6)[61.5] | 63.7 (12.1) [60.3] |
| Age group: N (%) | ||
| 50–59 years old | 69 (42.0) | 9955 (48.7) |
| 60–69 years old | 44 (26.9) | 4475 (21.9) |
| ≥70 years old | 51 (31.1) | 6023 (29.4) |
| Female: N(%) | 101 (61.6) | 10834 (53.0) |
| Comorbid conditions | ||
| COPD2 | 7 (4.3) | 1290 (6.3) |
| CHF3 | 7 (4.3) | 596 (2.9) |
1
There were 20,453 unique individuals who were included in the cohort for at least 1 of the 4 seasons. Of these 13,355 (65%) were in all 4 seasons; 2452(12%) were in 3 seasons, and 2313(11%) were in two seasons.
2
Chronic obstructive pulmonary disease (COPD) defined having an ICD-9 code within the range of 491.001–492.999 in the years 2005 to 2010 for cohort or prior to the study season for RSV cases.
3
Congestive heart failure (CHF) defined as having an ICD-9 code within the range of 428.001–428.9 in the years 2005 to 2010 for cohort or prior to the study season for RSV cases.