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Attack rate by grade, class and sex in hepatitis A outbreak, Anhui province, China, 2011
| Total cases | No. of cases | AR (%) | RR | 95% CI | |
|---|---|---|---|---|---|
| Grade 1 | 153 | 10 | 6·536 | 7·451 | 2·591–21·428 |
| Grade 2 | 104 | 6 | 5·769 | 6·577 | 2·214–19·540 |
| Grade 3 | 117 | 7 | 5·983 | 6·821 | 2·322–20·032 |
| Grade 4 | 111 | 3 | 2·703 | 3·081 | 0·963–9·853 |
| Grade 5 | 99 | 1 | 1·010 | 1·152 | 0·278–4·768 |
| Grade 6 | 114 | 1 | 0·877 | Ref. | |
| Male | 400 | 23 | 5·750 | 3·427 | 1·630–12·848 |
| Female | 298 | 5 | 1·678 | Ref. | |
| Total | 698 | 28 | 4·010 |
AR, Attack rate; RR, risk ratio; CI, confidence interval.
