Table 2. Oseltamivir prescription rates/100,000 enrollees by age and chronic disease classification, United States, weeks 36–44, 2004 and 2005.
| Characteristic | 2004 | 2005 | Rate ratio (2005/2004) | 95% Confidence interval |
|---|---|---|---|---|
| Age group, y | ||||
| <1 | 0.26 | 10.65 | 40.7 | (5.6–294) |
| 1–4 | 8.95 | 65.95 | 7.4 | (6.3–8.6) |
| 5–17 | 11.12 | 81.28 | 7.3 | (6.8–7.9) |
| 18–24 | 19.55 | 81.42 | 4.2 | (3.8–4.5) |
| 25–49 | 33.08 | 120.97 | 3.7 | (3.5–3.8) |
| 50–64 | 63.33 | 211.26 | 3.3 | (3.2–3.4) |
|
>65 |
69.04 |
168.20 |
2.4 |
(2.4–2.5) |
| Chronic disease classification* | ||||
| Pulmonary | 77.66 | 268.50 | 3.46 | (3.33–3.60) |
| Immune deficient | 67.75 | 240.16 | 3.54 | (3.21–3.91) |
| Neurologic | 54.57 | 207.43 | 3.80 | (3.47–4.15) |
| Cardiac | 54.11 | 196.92 | 3.64 | (3.54–3.74) |
| Diabetes | 50.85 | 143.85 | 2.83 | (2.64–3.02) |
| Chronic disease absent |
14.07 |
89.50 |
6.36 |
(6.10–6.62) |
| *Rates from chronic disease classification include only enrollees >18 y of age. Except for the chronic disease absent category, all chronic disease classifications were not mutually exclusive. Chronic disease classification is derived from the chronic disease index, which has been validated (10). | ||||