Table 1 Basic information of the first-time blood donors stratified by birth date
| Â | Born before July 1986 | Born after July 1986 | p-value |
|---|---|---|---|
HBV NAT |  |  | < 0.001 |
 Negative | 156,763 (95.47) | 658,162 (99.75) |  |
 Positive | 7438 (4.53) | 1680 (0.25) |  |
Sex |  |  | < 0.001 |
 Women | 104,463 (63.62) | 279,276 (42.32) |  |
 Men | 59,738 (36.38) | 380,566 (57.68) |  |
Age (years) |  |  | < 0.001 |
17–29 | 1879 (1.14) | 654,886 (99.25) |  |
30–65 | 162,322 (98.86) | 4956 (0.75) |  |
Blood type | Â | Â | 0.683 |
 A | 43,796 (26.67) | 175,650 (26.62) |  |
 B | 39,811 (24.25) | 159,438 (24.16) |  |
 O | 70,796 (43.12) | 284,973 (43.19) |  |
 AB | 9798 (5.97) | 39,781 (6.03) |  |
BMI (kg/m2) |  |  | < 0.001 |
  ≤ 24 | 91,484 (55.71) | 462,317 (70.06) |  |
  > 24 | 72,717 (44.29) | 197,525 (29.94) |  |
ALT (U/L) | 21.64 ± 17.80 | 17.77 ± 16.85 | < 0.001 |
Residential area |  |  | < 0.001 |
 Northern | 57,801 (35.20) | 178,238 (27.01) |  |
 North-Central | 26,669 (16.24) | 99,438 (15.07) |  |
 Central | 32,150 (19.58) | 144,680 (21.93) |  |
 Central-South | 21,879 (13.32) | 105,406 (15.97) |  |
 Southern | 21,590 (13.15) | 111,239 (16.86) |  |
 Eastern | 3387 (2.06) | 17,137 (2.60) |  |
 Island | 725 (0.44) | 3704 (0.56) |  |
Occupation |  |  | < 0.001 |
 Student | 846 (0.52) | 419,940 (63.64) |  |
 Military/civil servant/teacher | 9798 (5.97) | 121,172 (18.36) |  |
 Laborer/farmer and fisherman | 33,115 (20.17) | 23,542 (3.57) |  |
 Business/technician/specialist | 25,511 (15.54) | 14,314 (2.17) |  |
 Service worker | 34,911 (21.26) | 37,933 (5.75) |  |
 Others (including housekeepers) | 60,020 (36.55) | 42,941 (6.51) |  |