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Table 1 The general condition of the patients

From: Delayed drainage versus autotransfusion drainage and routine drainage after total knee arthroplasty: a comparative study

Group Age Gender (male/female) Operation length (min) Disease (RA/OA) Preoperative hemoglobin (g/L)
Routine drainage (n = 18) 63.72 ± 6.10 8/10 87.50 ± 13.09 2/16 129.44 ± 7.22
Blood transfusion (n = 25) 62.56 ± 6.83 9/16 82.40 ± 12.64 3/22 130.36 ± 6.01
Delayed drainage (n = 18) 65.25 ± 7.22 4/8 86.50 ± 18.27 2/10 131.92 ± 5.66
Statistics F = 0.666 χ2 = 0.469 F = 0.490 χ2 = 0.222 F = 0.544
P value 0.518 0.791 0.615 0.895 0.584