Table 3

Comparison of the mean reduction in hemoglobin between patients undergoing primary arthroplasty who received warfarin and those who received dalteparin

Hemoglobin, g/L	Drug; mean (SD)		p value
Hemoglobin, g/L	Warfarin^*	Dalteparin^†	p value
Preoperative level	137.97 (13.8)	139.49 (13.3)	0.023
Postoperative level	94.67 (14.1)	93.30 (13.0)	0.041
Drop
Total	43.20 (14.5)	46.10 (13.8)	< 0.001
Hip arthroplasty group	43.51 (14.5)	46.15 (13.8)	0.014
Knee arthroplasty group	43.10 (14.1)	46.21 (13.1)	< 0.001

SD = standard deviation.
↵* Administered to patients undergoing primary arthroplasty between Jan. 1, 2004, and Dec. 31, 2004.
↵† Administered to patients undergoing primary arthroplasty between Jan. 1, 2005, and Dec. 31, 2005.