BMC Surgery

Table 3 Power study to determine number of patients needed for NMS group

From: A prospective, randomized, double-blinded single-site control study comparing blood loss prevention of tranexamic acid (TXA) to epsilon aminocaproic acid (EACA) for corrective spinal surgery

	TXA		Amicar		Control
	Blood loss	Standard Deviation	Blood Loss	Standard Deviation	Blood Loss	Standard Deviation	Sample Size Needed
Intra-op blood loss	1408 mL	+/- 605 mL	-	-	2690 mL	+/- 1266 mL	14
Intra-op blood loss	1976 mL	+/- 860 mL	1117 mL	+/- 718 mL	-	-	30
Total blood transfused	808 mL	+/- 531 mL	-	-	1391 mL	+/- 723 mL	34

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ISSN: 1471-2482

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