Supplemental Digital Content. Table. Comparison of demographics and clinical characteristics between responders and non-responders
Variable Followed-up
N = 245
Lost to follow-up N = 105
p-value
Age, median (IQR) 62 (55-69) 63 (54-71) 0.64
Male gender, n (%) 117 (48) 60 (57) 0.11
BMI, median (IQR) 26 (30-34) 25 (28-34) 0.18
Race, n (%) 0.65
White 201 (82) 84 (80)
Other 44 (18) 21 (20)
Education, n (%) 0.18
Less than High School 19 (8) 13 (13)
High School Diploma 109 (45) 41 (40)
Two-year College Degree 52 (22) 15 (15)
Four-year College Degree 31 (13) 20 (19)
Post-College 30 (12) 141 (4)
Smoking, n (%) 53 (22) 23 (22) 0.96
CAD, n (%) 26 (11) 14 (13) 0.46
Diabetes, n (%) 41 (17) 30 (29) 0.012
Depression, n (%) 0.56
Moderate 99 (40) 42 (40)
Extreme 30 (12) 9 (9)
ASA, n (%) 0.32
1/2 115 (47) 43 (41)
3/4 130 (53) 62 (59)
Employment, n (%) 0.055
Sedentary 23 (9) 16 (15)
1 1
2 3
1 2
Light 32 (13) 4 (4)
Medium 26 (11) 9 (9)
Heavy 18 (7) 10 (10)
Unemployed/attending school 146 (60) 66 (63)
Worker’s Compensation, n (%) 4 (2) 0 (0) 0.19
Liability, n (%) 11 (5) 5 (5) 0.89
Insurance, n (%) 0.41
Uninsured 3 (1) 4 (4)
Medicare 104 (42) 41 (39)
Medicaid 6 (2) 5 (5)
VA/Government 11( 4) 5 (5)
Private 121 (49) 50 (48)
Symptom duration, n (%) 0.89
Less than 3 months 25 (11) 10 (10)
3-12 months 99 (42) 40 (40)
More than 12 months 113 (48) 51 (50)
Motor deficit present, n (%) 135 (55) 59 (57) 0.78
Numbness present, n (%) 129 (53) 51 (49) 0.48
Independent ambulation, n (%) 208 (85) 82 (78) 0.12
Number of levels 0.008
3 149 (61) 64 (61)
4 80 (33) 24 (23)
5 16 (7) 17 (16)
Diagnosis, n (%) 0.92
Disc Herniation 28 (11) 13 (12)
Foraminal Stenosis 53 (22) 24 (23)
Central Stenosis 164 (67) 68 (65)
3 2 4
Baseline PROs, median (IQR)
NDI 38 (26-52) 34 (20-54) 0.59
EQ5D 0.69 (0.44-0.78) 0.69 (0.38-0.80) 0.71
NRS-Neck Pain 6 (3-8) 6 (2-8) 0.74
NRS-Arm Pain 5 (2-8) 5 (0-7) 0.21
mJOA 13 (11-14) 13 (11-14) 0.94
3 4
5 6 7 8
5 6
