Table 1.

List of Modeling Variables

Category	Variable	Degrees of Freedom (df)	Levels
Patient Demographics	Age (years)	1	continuous
	Gender	1	male, female
	Body Mass Index (BMI)	1	continuous
	Baseline activity level (Marx)	1	continuous
Surgical Information	Revision number	1	1, 2 or more
	Prior graft type	3	autograft (BTB), autograft (soft tissue), allograft, other/unknown
	Alignment	1	continuous
	Meniscal pathology
	* medial	1	intact, disrupted
	* lateral	1	intact, disrupted
	Articular cartilage pathology	2	grades 0/1 (“normal”), grades 2/3 (“intermediate”), grade 4 (“advanced”) on at least one surface