Table 2.

Base Case Values.

	Treatments
	CC	Spacer	DS
Variable	Base Case	Base Case	Base Case
Failure rate, quarterly	4.3%	2.7%	1.2%
1 Level	NA	50.0%	50.0%
2 Levels	NA	50.0%	50.0%
Adverse event*	NA	0.0%	5.4%
Inpatient rehabilitation	NA	0.0%	3.9%
Fusion, secondary treatmentx			31%
Probability of utilization - Qtr of Procedure
Healthcare	NA	45.2%	76.2%
Medications	NA	94.4%	94.4%
Diagnostics	NA	22.2%	22.2%
Probability of utilization - FU Quarters
Healthcare	94.0%	13.1%	12.9%
Medications	100.0%	64.3%	64.3%
Diagnostics	86.0%	8.8%	8.8%
Costs
Procedure
1 Level		$7,367	$7,883
2 Levels		$7,683	$8,155
1 Level, fusionx		NA	$26,118
2 Levels, fusionx		NA	$27,662
Anesthesiology	NA	$386	$454/$567#
Inpatient rehabilitation	NA	NA	$9,100
Qtr of Procedure
Healthcare		$662	$774
Medications		$334	$334
Diagnostics		$333	$333
FU Quarters
Healthcare	$289	$665	$1,060
Medications	$498	$337	$337
Diagnostics	$162	$870	$870
Adverse Event		NA	$6,770
QALY gained‡
Baseline to 3 mo	0.008	0.111	0.091
3 mo - 6 mo	0.016	0.144	0.173
6 mo - 9 mo	0.016	0.144	0.162
9 mo - 12 mo	0.016	0.144	0.155
After 12 mo	0.016	0.144	0.151

^*Adverse Events (AE) that generate additional reimbursement outside of the global payment. Healthcare includes non-surgeon physician visits, physical therapy, chiropractic care, acupuncture. Medications include narcotics, muscle relaxants, NSAIDs, and oral steroids. Diagnostics include MRI scans, CT scans, x-rays, spine injections, and EMGs. Superion patients assumed to have the same level of utilization for non-surgeon physician visits, medications, and diagnostics as decompressive surgery patients.

^xDS with fusion was received by a portion of patients after DS or Spacer failure.

^#Anesthesiology rate for DS without fusion / Anesthesiology rate for DS with fusion.

^‡QALY gained is an annual amount; one-fourth of the value is accumulated each quarter.