Table 1. Comparison of blood donors seronegative and seropositive for Chagas disease, at FPS, São Paulo, Brazil, from 1996–2000, by age, gender, year of blood donation and mortality.
| All subjects | Seropositive | Seronegative | p-value | |
|---|---|---|---|---|
| N = 8,526 | N = 2,842 | N = 5,684 | ||
| n (%) | n (%) | n (%) | ||
| Gender | 0.114 | |||
| Male | 6,022 (70.6) | 1,976 (69.5) | 4,046 (71.2) | |
| Female | 2,504 (29.4) | 866 (30.5) | 1,638 (28.8) | |
| Age groups (years) | <0.001 | |||
| 18–29 | 3,523 (41.4) | 646 (22.7) | 2,886 (50.8) | |
| 30–39 | 2,424 (28.4) | 795 (28.0) | 1,629 (28.7) | |
| 40–49 | 1,726 (20.3) | 893 (31.4) | 833 (14.6) | |
| >50 | 844 (9.9) | 508 (17.9) | 336 (5.9) | |
| Year of donation | 1,000 | |||
| 1996 | 2,310 (27.1) | 771 (27.1) | 1,539 (27.1) | |
| 1997 | 2,153 (25.3) | 717 (25.2) | 1,436 (25.3) | |
| 1998 | 1,735 (20.3) | 578 (20.4) | 1,157 (20.3) | |
| 1999 | 1,215 (14.2) | 406 (14.3) | 809 (14.2) | |
| 2000 | 1,113 (13.1) | 370 (13.0) | 743 (13.1) | |
| Mortality | 262 (3.1) | 159 (5.6) | 103 (1.8) | <0.001 |
| Average age at death | 48.6 ± 11.6 | 50.8 ± 11.3 | 45.1 ± 11.3 |