Appendix Table 1.

The association between baseline demographic and clinical characteristics and participation up to 1-year

Baseline characteristics	No N=26		Yes N=241		P-value
	N	% or Mean (SD)	N	% or Mean (SD)
Age (years)	26	62.8 (8.3)	240	66.2 (8.7)	0.10
Female					0.02
No	4	15.4	95	39.4
Yes	22	84.6	146	60.6
Body mass index (kg/m2)	25	33.1 (7.3)	232	30.5 (6.6)	0.07
White race					<0.001
No	9	34.6	22	9.1
Yes	17	65.4	219	90.9
Education					0.26
High school or less	9	34.6	49	20.6
Some college, vocational, or technical education	6	23.1	62	26.0
Undergraduate or technical school degree	11	42.3	127	53.4
Surgical site					0.08
Maryland	10	38.5	84	34.8
Colorado	6	23.1	104	43.1
NYU-Langone	10	38.5	53	22.0
Living arrangement					0.31
Alone	8	30.8	51	21.4
Married or with partner	15	57.7	171	71.8
Other	3	11.5	16	6.7
Number of co-morbid conditions†					0.09
0	4	16.0	62	25.9
1	12	48.0	84	35.1
2	9	36.0	60	25.1
≥3	0	0	33	13.8
WOMAC function categories					<0.001
0–39	7	28.0	98	40.8
40–69	11	44.0	129	53.7
≥70	7	28.0	13	5.4
WOMAC pain categories					0.002
0–39	6	23.1	102	42.7
40–69	14	53.8	124	51.9
≥70	6	23.1	13	5.4
Number of painful body regions					0.13
0	2	7.7	53	22.0
1–2	13	50.0	121	50.2
≥3	11	42.3	67	27.8
Number pain sites§	26	3.3 (2.6)	241	2.5 (2.5)	0.05
Median (25th, 75th percentiles)		3 (1, 5)		2 (1, 4)
Range		0–10		0–15

^†Co-morbid conditions are comprised of diabetes mellitus, depression, stomach ulcers, cancer, chronic kidney disease, liver disease, cardiovascular disease, and hypertension

^§Index leg sites have been removed