| Group Statistics | Independent samples tests | |||||
---|---|---|---|---|---|---|---|
 | Transfusion | Levene's test | t-test for equality of means (equal variances assumed) | ||||
 |  | mean ± SD | Sig. | Sig (2-tailed) | Mean differ. | Std error differ. | 96% CI* lower/upper |
Age | NO | 63.6 ± 9.8 | 0.007 | 0.016 | -3.09 | 1.27 | -5.59/0.58 |
 | YES | 66.7 ± 7.1 |  |  |  |  |  |
Weight | NO | 79.3 ± 11.2 | 0.563 | 0.020 | 4.09 | 1.75 | 0.64/7.55 |
 | YES | 75.2 ± 10.9 |  |  |  |  |  |
Height | NO | 171.0 ± 6.2 | 0.12 | 0.000 | 4.94 | 1.19 | 2.60/7.29 |
 | YES | 166.1 ± 7.9 |  |  |  |  |  |
BMI | NO | 27.1 ± 3.2 | 0.442 | 0.745 | -0.17 | 0.53 | -1.22/0.88 |
 | YES | 27.2 ± 3.4 |  |  |  |  |  |
BSA | NO | 1.90 ± 0.15 | 0.949 | 0.001 | 0.90 | 0.02 | 0.04/0.14 |
 | YES | 1.81 ± 0.16 |  |  |  |  |  |
pre-op. Hct | NO | 42.1 ± 3.78 | 0.81 | 0.000 | 2.42 | 0.64 | 1.16/3.69 |
 | YES | 39.6 ± 4.10 |  |  |  |  |  |
discharge Hct | NO | 32.8 ± 2.21 | 0.829 | 0.586 | -1.19 | 0.35 | -0.87/0.49 |
 | YES | 33.0 ± 2.15 |  |  |  |  |  |