| N | Minimum | Maximum | Mean | Std. Deviation |
Age | 31 | 52.00 | 85.00 | 64.6452 | 9.03898 |
Duration of Preop Catheter (wks) | 17 | 1.00 | 4.00 | 3.1765 | 1.18508 |
Hemoglobin | 31 | 6.90 | 16.00 | 11.3097 | 2.05237 |