Volume 20, Number 10—October 2014
Research
Influenza-Associated Hospitalizations, Singapore, 2004–2008 and 2010–2012
Li Wei Ang
, Cindy Lim, Vernon Jian Ming Lee, Stefan Ma, Wei Wei Tiong, Peng Lim Ooi, Raymond Tzer Pin Lin, Lyn James, and Jeffery Cutter
, Cindy Lim, Vernon Jian Ming Lee, Stefan Ma, Wei Wei Tiong, Peng Lim Ooi, Raymond Tzer Pin Lin, Lyn James, and Jeffery Cutter
Table 3
Estimated influenza-associated hospitalizations for pneumonia and influenza in Singapore during 2 study periods, 2004–2008 and 2010–2012
| Study period, patient age | Excess % (95% CI) | Excess no. per year (95% CI) | Excess no. per 100,000 person-years (95% CI) |
|---|---|---|---|
| Study period 1, 2004–2008 | |||
| 0–5 m | 35.2 (27.3–41.8) | 40 (31–48) | 213.9 (166.1–253.9) |
| 6–23 m | 18.9 (14.7–23.7) | 74 (58–93) | 119.1 (93.0–149.6) |
| 2–4 y | 15.6 (12.2–19.8) | 141 (110–179) | 108.3 (85.0–137.9) |
| 5–14 y | 21.7 (17.3–26.5) | 150 (119–183) | 28.8 (23.0–35.3) |
| 15–24 y | 25.1 (21.2–29.9) | 87 (73–103) | 12.5 (10.6–14.9) |
| 25–44 y | 16.4 (13.4–20.0) | 139 (113–169) | 8.1 (6.6–9.9) |
| 45–64 y | 15.1 (12.5–18.2) | 251 (208–302) | 25.1 (20.8–30.2) |
| 65–74 y | 14.7 (12.3–18.0) | 238 (198–291) | 114.9 (95.8–140.5) |
| ≥75 y | 13.0 (10.9–15.2) | 518 (436–605) | 452.2 (380.8–528.8) |
| All* |
11.9 (10.4–13.8) |
1,259 (1,100–1,456) |
28.3 (24.7–32.7) |
| Study period 2, 2010–2012 | |||
| 0–5 m | 41.3 (25.6–56.9) | 68 (42–94) | 363.6 (225.0–500.5) |
| 6–23 m | 13.3 (6.7–23.4) | 62 (31–108) | 95.8 (48.3–168.3) |
| 2–4 y | 9.2 (4.6–16.7) | 88 (44–160) | 64.3 (32.4–117.2) |
| 5–14 y | 12.1 (6.0–21.5) | 94 (47–166) | 19.1 (9.5–33.8) |
| 15–24 y | 23.6 (12.7–38.2) | 90 (49–146) | 11.4 (6.2–18.5) |
| 25–44 y | 20.9 (12.3–30.5) | 201 (118–294) | 9.7 (5.7–14.2) |
| 45–64 y | 15.1 (9.1–22.0) | 366 (220–535) | 29.7 (17.9–43.5) |
| 65–74 y | 13.6 (8.2–19.9) | 279 (168–409) | 113.8 (68.6–167.0) |
| ≥75 y | 12.5 (7.8–18.0) | 687 (431–993) | 458.9 (288.3–663.8) |
| All* |
11.2 (7.5–15.4) |
1,535 (1,020–2,106) |
29.6 (19.7–40.6) |
| *The excess number of hospitalizations was estimated from a model developed for each of the age groups and the all-age group. Thus, the number of excess hospitalizations in the all-age group was not the sum of excess hospitalizations across the 9 age groups. | |||
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