Characteristics | Group A | Group B | Group C | Group D | p-value |
---|---|---|---|---|---|
 | (n = 60) | (n = 60) | (n = 60) | (n = 60) |  |
Male : Female | 8 : 52 | 9 : 51 | 10 : 50 | 8 : 52 | 0.946 |
Age (yr)* | 69.8 ± 6.3 | 69.4 ± 6.3 | 68.9 ± 7.5 | 70.1 ± 7.2 | 0.418 |
Pre-op Hb (g/dl)* | 12.5 ± 1.1 | 12.4 ± 1.1 | 12.4 ± 1.1 | 12.6 ± 1.0 | 0.515 |