Table 2. Incidence rate and preventable fraction of hepatitis A cases associated with all reported outbreaks.
| Variable | Incidence rate* Period 1: 1991–98 (95%CI) |
Incidence rate* Period 2: 2000–12 (95%CI) |
Incidence rate* Period 1 + period 2 (95%CI) |
Preventable fraction** (95%CI) |
|---|---|---|---|---|
| Age group (in years) | ||||
| 0–4 | 5.320 (4.403–6.371) |
3.119 (2.637–3.664) |
3.820 (3.375–4.308) |
18.35 (9.59–27.11) |
| 5–14 | 4.189 (3.666–4.766) |
2.893 (2.543–3.278) |
3.403 (3.104–3.723) |
14.99 (7.59–22.38) |
| 15–24 | 1.287 (1.049–1.562) |
0.477 (0.353–0.630) |
0.830 (0.702–0.973) |
42.53 (29.30–55.75) |
| 25–44 | 0.958 (0.805–1.131) |
1.825 (1.676–1.982) |
1.547 (1.434–1.666) |
|
| ≥ 45 | 0.027 (0.009–0.062) |
0.075 (0.050–0.109) |
0.059 (0.041–0.083) |
|
| All | 1.528 (1.420–1.641) |
1.275 (1.202–1.350) |
1.363 (1.302–1.425) |
6.46 (3.11–9.82) |
| Sex | ||||
| Men | 1.503 (1.351–1.667) |
1.551 (1.438–1.670) |
1.534 (1.443–1.630) |
|
| Women | 0.914 (0.799–1.041) |
0.688 (0.615–0.768) |
0.767 (0.704–0.834) |
10.32 (3.95–16.69) |
CI, confidence interval; *per 100,000 persons-year; **in percentages. Only calculated if a decrease was observed.