Table 4.
Counts and incidence rates per 1,000 person-years of excess total pneumonia ED visits, excess outpatient pneumonia ED visits, and excess pneumonia ED visits resulting in hospitalization during the influenza A (H1N1) pandemic year in the United States by age group, April 2009–March 2010.a
| Age Group (years) | Excess Total Pneumonia ED Visits | Excess Outpatient Pneumonia ED Visits | Excess Hospitalized Pneumonia ED Visits | |||
|---|---|---|---|---|---|---|
| Counts | Rates per 1000 (95% CI) | Counts | Rates per 1000 (95% CI) | Counts | Rates per 1000 (95% CI) | |
| < 2 | 13,158 | 1.57 (0.96, 2.18) | 10,365 | 1.24 (0.69, 1.78) | 2,982 | 0.36 (0.07, 0.64) |
|
| ||||||
| 2–4 | 22,999 | 1.79 (1.52, 2.06) | 18,760 | 1.46 (1.22, 1.69) | 4,374 | 0.34 (0.22, 0.46) |
|
| ||||||
| 5–17 | 38,072 | 0.71 (0.64, 0.79) | 30,917 | 0.58 (0.52, 0.64) | 6,500 | 0.12 (0.09, 0.16) |
|
| ||||||
| 18–39 | 38,606 | 0.42 (0.38, 0.46) | 25,205 | 0.27 (0.24, 0.30) | 14,183 | 0.15 (0.13, 0.17) |
|
| ||||||
| 40–64 | 56,151 | 0.56 (0.49, 0.62) | 18,534 | 0.18 (0.15, 0.22) | 37,662 | 0.37 (0.33, 0.42) |
|
| ||||||
| 65–74 | 13,301 | 0.62 (0.45, 0.80) | 1,006 | 0.05 (−0.02, 0.12) | 11,503 | 0.54 (0.38, 0.70) |
|
| ||||||
| 75–84 | 2,718 | 0.21 (−0.09, 0.50) | −652 | −0.05 (−0.16, 0.06) | 2,716 | 0.21 (−0.06, 0.47) |
|
| ||||||
| ≥ 85 | −4,446 | −0.77 (−1.33, −0.20) | −901 | −0.16 (−0.33, 0.02) | −3,846 | −0.66 (−1.16, −0.17) |
|
| ||||||
| All Ages | 180,560 | 0.59 (0.55, 0.62) | 103,232 | 0.33 (0.31, 0.36) | 76,073 | 0.25 0.22, 0.27) |
a
Separate models were developed for each age group and each outcome (total ED visits, outpatient ED visits, and hospitalized ED visits). Separate estimations for other ED dispositions (e.g. hospital transfers and ED deaths) were not performed. There, the excess total ED visits may not precisely equal the sum of outpatient visits and hospitalized visits.