Table 3 Description of overall NDI scores and categories.

NDI^a category	Preoperative phase		Postoperative phase		Mean dif.	t^c	p-value
NDI^a category	N^b	%	N	%	Mean dif.	t^c	p-value
Minimal disability	0	0.0	15	42.9	1.571	15.289	< 0.001
Moderate disability	0	0.0	20	57.1
Severe disability	30	85.7	0	0.0
Crippling disability	5	14.3	0	0.0
Bed-bound	0	0.0	0	0.0
Overall mean ± SD^d	53.847 ± 6.658		21.568 ± 5.283		32.279	26.943	< 0.001

^aNDI = Neck disability index. ^bN = Number (frequency), ^ct = paired t-test value, ^dSD = standard deviation.

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