Table 2.

Mean Hb (g / dl) and Hct (%) along with the standard deviations (± SD) before and after surgery

	TEA group	Controls	P value	Power
Preoperative Hb	12.78 ± 1.85	13.04 ± 1.72	0.459	0.119
Preopearative Hct	35.30 ± 2.94	35.78 ± 2.26	0.349	0.147#
Postoperative Hb (six hours after surgery)	11.79 ± 1.96	10.25 ± 1.40	0.000*	0.996
Postoperative Hct	36.61 ± 2.16	36.89 ± 2.47	0.536	0.117#
Hb at discharge	12.26 ± 1.45	11.78 ± 1.33	0.075	0.436

^*Significant

^#Mann-Whitney U Test