Table 2.

Subgroup analysis of postoperative hemoglobin decline

Outcome or subgroup	Studies	Effect estimate
		χ 2	I 2 (%)	MD	95% CI	P value
Cemented prosthesis	3	10.31	81	−0.62	[−1.22,−0.03]	0.006
Total dose = 10 ml	3	3.03	34	−0.52	[−0.77,−0.26]	0.22
Duration of drainage	3	3.03	34	−0.52	[−0.77,−0.26]	0.22