Table 3.

Statistically significant predictors of adherence to treatment among RCT patients.

	Assigned to Surgery			Assigned to Non-operative
	Treatment Received within 4 Years		p-value	Treatment Received within 4 Years		p-value
	Surgery	Non- operative		Surgery	Non-operative
	(n=91)	(n=41)		(n=73)	(n=73)
Race - White	81 (89%)	28 (68%)	0.008	67 (92%)	62 (85%)	0.30
Comorbidities
Hypertension	41 (45%)	27 (66%)	0.04	31 (42%)	35 (48%)	0.62
Mental Component Summary (MCS) Score	50 (12.1)	50.3 (14.2)	0.88	47.1 (12.7)	52 (10.9)	0.012
Oswestry (ODI)	44.7 (18)	38.3 (19.1)	0.07	46 (18.3)	39.3 (15.8)	0.019
Stenosis Frequency Index (0-24)	14.6 (5.4)	11.8 (6.3)	0.009	14.3 (5.5)	12.1 (5.5)	0.019
Stenosis Bothersome Index (0-24)	14.9 (4.9)	12.1 (6.1)	0.007	15 (5.5)	12.5 (6.1)	0.011
Leg Pain Bothersomeness	4.5 (1.6)	4 (1.9)	0.08	4.5 (1.5)	3.9 (1.8)	0.049
Satisfaction with symptoms - very dissatisfied	67 (74%)	23 (56%)	0.07	56 (77%)	37 (51%)	0.002
Problem getting better or worse			0.007			0.15
Getting better	2 ( 2%)	6 (15%)		2 ( 3%)	8 (11%)
Staying about the same	28 (31%)	17 (41%)		25 (34%)	25 (34%)
Getting worse	58 (64%)	18 (44%)		44 (60%)	40 (55%)
Treatment preference			0.02			<0.001
Definitely prefer non-surg	9 (10%)	8 (20%)		7 (10%)	13 (18%)
Probably prefer non-surg	16 (18%)	14 (34%)		12 (16%)	19 (26%)
Not sure	32 (35%)	12 (29%)		19 (26%)	32 (44%)
Probably prefer surgery	23 (25%)	7 (17%)		17 (23%)	4 ( 5%)
Definitely prefer surgery	11 (12%)	0 ( 0%)		18 (25%)	4 ( 5%)

^*The SF-36 scores range from 0 to 100, with higher score indicating less severe symptoms.

^†The Oswestry Disability Index ranges from 0 to 100, with lower scores indicating less severe symptoms.

^‡The Stenosis Frequency Index ranges from 0 to 24, with lower scores indicating less severe symptoms.

^§The Stenosis Bothersomeness Index ranges from 0 to 24, with lower scores indicating less severe symptoms.

^¶The Leg Pain Bothersomeness Scale ranges from 0 to 6, with lower scores indicating less severe symptoms.