Table 2

Patient Demographics – intent to treat population.

	Patient Group
Variable	TDR	ACDF	p value
Age (years)			0.5657^*
N	164	81
Mean (SD)	43.3 (9.2)	44.0 (8.2)
Gender n (%)			0.6843^**
Male	78 (47.6%)	36 (44.4%)
Female	86 (52.4%)	45 (55.6%)
Ethnicity n (%)			0.6667^**
Hispanic or Latino	3 (1.8%)	2 (2.5%)
Not Hispanic or Latino	161 (98.2%)	79 (97.5%)
Race n (%)			0.0710^**
American Indian	2 (1.2%)	1 (1.2%)
Caucasian	152 (92.7%)	69 (85.2%)
Asian	3 (1.8%)	1 (1.2%)
Black or African American	4 (2.4%)	10 (12.3%)
Native Hawaiian/Other Pacific Islander	1 (0.6%)	0
Other	2 (1.2%)	0
BMI			0.8460^*
Mean (SD)	27.3 (4.4)	27.4 (4.2)
Work Status n (%)			0.3264^**
Being able to work	108 (65.9%)	46 (56.8%)
Not being able to work	37 (22.6%)	22 (27.2%)
N/A	19 (11.6%)	13 (16.0%)
Driving Status n (%)			0.5035^**
Being able to drive	155 (94.5%)	79 (97.5%)
Not being able to drive	8 (4.9%)	2 (2.5%)
N/A	1 (0.6%)	0
NDI Mean (SD)	54.0 (14.0)	54.2 (14.6)	0.9290^*
VAS Neck Pain Mean (SD)	70.8 (22.4)	70.1 (21.5)	0.8354^*
VAS Left Arm Pain Mean (SD)	46.7 (36.5)	55.3 (37.3)	0.0839^*
VAS Right Arm Pain Mean (SD)	41.0 (36.2)	34.8 (35.6)	0.2104^*
SF-12 PCS Mean (SD)	32.5 (5.91)	33.8 (6.36)	0.1055^*
SF-12 MCS Mean (SD)	42.1 (13.1)	42.2 (10.4)	0.9792^*

↵* Using unpaired t-test to compare across treatment groups
↵** Using Fisher exact test to compare. Fisher exact p-value calculation is based on Caucasian vs. non-Caucasian subjects. Fisher exact p-value is based on ‘being able to’ vs. ‘not being able to’