Table 1.
Hepatitis B immune status by risk category and sex, 2007 prisoner serosurvey, ages 18–58 years
| Males | Females | |||||
|---|---|---|---|---|---|---|
| Risk category* | Total tested | % Immune through past infection (95% CI)† | % Vaccine conferred immunity (95% CI)† | Total tested | % Immune through past infection (95% CI)† | % Vaccine conferred immunity (95% CI)† |
| Age group, years | ||||||
| 18–24 | 138 | 7·2 (3·5–12·9) | 38·4 (30·3–47·1) | 7 | 0 | 42·9 (9·9–81·6) |
| 25–29 | 104 | 21·2 (13·8–30·3) | 30·8 (22·1–40·6) | 16 | 12·5 (1·6–38·3) | 43·8 (19·7–70·1) |
| 30–39 | 151 | 25·8 (19·1–33·6) | 23·8 (17·3–31·4) | 27 | 33·3 (16·5–54·0) | 18·5 (6·3–38·1) |
| 40–58 | 83 | 26·5 (17·4–37·3) | 16·9 (9·5–26·7) | 5 | 40 (5·3–85·3) | 0 |
| Indigenous | 83 | 44·9 (31·2–58·7)‡ | 21·2 (10·6–31·7)‡ | 18 | 27·8 (9·7–53·5) | 33·3 (13·3–59·0) |
| Non-Indigenous | 387 | 17·5 (12·6–22·4)‡ | 24·9 (19·9–29·8)‡ | 36 | 22·2 (10·1–39·2) | 22·2 (10·1–39·2) |
| IDU | 262 | 37·8 (26·8–42·7)‡ | 26·5 (20·1–32·9)‡ | 41 | 26·8 (14·2–42·9) | 29·3 (16·1–45·5) |
| Non-IDU | 214 | 9·1 (4·3–13·9)‡ | 21·1 (14·9–27·4)‡ | 14 | 14·3 (1·8–42·8) | 21·4 (4·7–50·8) |
| First-time entrant | 150 | 9·9 (5·5–14·0)‡ | 13·7 (9·3–18·1)‡ | 19 | 26·3 (9·1–51·2) | 21·1 (6·1–45·6) |
| Previous imprisonment | 323 | 28·3 (21·9–34·7)‡ | 29·3 (23·5–35·1)‡ | 36 | 22·2 (10·1–39·2) | 30·6 (16·3–48·1) |
| Total | 476 | 22·3 (16·4–28·2)‡ | 24·1 (18·7–29·6)‡ | 55 | 23·6 (13·2–37·0) | 27·3 (16·1–41·0) |
CI, Confidence interval; IDU, injecting drug user.
*
Three samples were missing whether first-time/previous imprisonment, seven were missing Indigenous status.
†
Percent of the total tested for each sex and risk category.
‡
Adjusted to the age-specific distribution of the 2007 Australian male population.