| Group | Cases (male) | Age (years) | RBC (×1012/L) | Hb (g/L) | Hct (%) |
| Plain control | 114 (73) | 58.60 ± 14.40 | 4.75 ± 0.52 | 141.30 ± 13.20 | 42.04 ± 5.28 |
| Observation group A | 83 (41) | 62.54 ± 11.54 | 4.82 ± 0.64(1) | 141.42 ± 17.93 | 42.43 ± 4.66 |
| Observation group B | 279 (138) | 60.99 ± 11.09 | 4.64 ± 0.46(2) | 139.60 ± 13.35 | 41.69 ± 3.47 |