Table 1.

Cost-Effectiveness of Prophylactic Vancomycin Powder for Lumbar Laminectomy.

Vancomycin Powder (1 g) Cost (US$)	Laminectomy		Laminectomy and Fusion
	Break-Even Infection Rate (%)	Break-Even ARR (%)	Break-Even Infection Rate (%)	Break-Even ARR (%)
2.50	4.19	0.01	8.50	0.003
3.06a	4.19	0.01	8.50	0.003
10.00	4.15	0.05	8.49	0.01
17.00	4.12	0.08	8.48	0.02
34.00	4.04	0.16	8.46	0.04
44.00	3.99	0.21	8.45	0.05
50.00	3.96	0.24	8.45	0.05
75.00	3.84	0.36	8.42	0.08
100.00	3.73	0.47	8.39	0.11

Abbreviation: ARR, absolute risk reduction.

^a Value at our institution.