Table 1 Demographics data and seroprevalence of hepatitis B virus (HBV) markers and titers
Age group | 6 y/o | 12 y/o | 15 y/o | 18 y/o | 6-12 y/o | 15-18 y/o |
|---|---|---|---|---|---|---|
Item | (n = 524) | (n = 450) | (n = 1464) | (n = 4512) | (n = 974) | (n = 5976) |
Gender | ||||||
Male, n (%) | 299(57.1) | 205(45.6) | 740(50.5) | 1657(36.7) | 504(51.7) | 2397(40.1) |
Female, n (%) | 225(42.9) | 245(54.4) | 724(49.5) | 2855(63.3) | 470(48.3) | 3579(59.9) |
Age (Mean ± SD, yr) | 6.5 ± 0.3 | 12.5 ± 0.3 | 15.5 ± 0.5 | 18.7 ± 0.7 | 9.3 ± 3.0 | 17.9 ± 1.5 |
Anti-HBs (+), n | 332 | 142 | 574 | 2033 | 474 | 2607 |
(%, 95% CI) | (63.4, 59.3-67.5) | (31.6, 27.3-35.9) | (39.2, 36.7-41.7) | (45.1, 43.6-46.6) | (48.7, 45.6-51.8) | (43.6, 42.3-44.9) |
Anti-HBs (−), n | 192 | 308 | 890 | 2479 | 500 | 3369 |
(%, 95% CI) | (36.6, 32.5-40.7) | (68.4, 64.1-72.7) | (60.8, 58.3-63.3) | (54.9, 53.4-56.4) | (51.3, 48.2-54.4) | (56.4, 55.1-57.7) |
P-value | <0.001* | 0.003* | ||||
Anti-HBs median titer | 21.2 | NA | 3.9 | 4.8 | 21.2 | 4.6 |
P-value | <0.001* | <0.001* | ||||
HBsAg (+), n | 1 | 7 | 16 | 56 | 8 | 72 |
(%, 95% CI) | (0.2, 0.0-0.6) | (1.6, 0.4-2.8) | (1.1, 0.6-1.6) | (1.2, 0.9-1.5) | (0.8, 0.2-1.4) | (1.2, 0.9-1.5) |
HBsAg (−), n | 523 | 443 | 1448 | 4456 | 966 | 5904 |
(%, 95% CI) | (99.8, 99.4-100.0) | (98.4, 97.2-99.6) | (98.9, 98.4-99.4) | (98.8, 98.5-99.1) | (99.2, 98.6-99.8) | (98.8, 98.5-99.1) |
P-value | 0.154 | 0.336 | ||||