Table 3. Neck Disability Index (NDI) total score in percentage before and at follow-up in the group with positive response and in nonresponders to the treatment.

	NDI before treatment	NDI at follow-up	P
Positive response (n = 69)
Mean (median)	44 (40)	30 (28)	.000
SD (range)	± 18.0 (6–94)	± 18.3 (4–86)
Nonresponders (n = 71)
Mean (median)	47 (46)	46 (48)	.698
SD (range)	± 14.1 (14–76)	± 13.5 (10–76)