Table III.
Distribution of anti-HBs titres in different age groups.
| Age | <10 IU/L (%) | 10–100 IU/L (%) | >100 IU/L (%) | Total (%) |
|---|---|---|---|---|
| <30 years | 134 (29.5) | 79 (17.4) | 241 (53.1) | 454 (43.9) |
| 31–40 years | 71 (23.2) | 70 (22.9) | 165 (53.9) | 306 (29.6) |
| 41–50 years | 43 (19.6) | 59 (26.8) | 118 (53.6) | 220 (21.3) |
| >50 years | 8 (15.1) | 13 (24.5) | 32 (60.4) | 53 (5.1) |
|
| ||||
| Total | 256 (24.8) | 221 (21.4) | 556 (53.8) | 1,033 (100) |
Serum anti-HBs titres <10 IU/L were considered negative. χ2=18.1, p=0.006. Anti-HBs: antibody to hepatitis B virus surface.