Table 3.

Follow-up disability and pain intensity comparison (n = 19).

	CEN	Non-CEN
Mean NDI at First Examination	17.85	22.56
Mean NDI at Follow-Up	3.71	14.22
Mean Difference	14.14	8.34
Mean NPRS at First Examination	5.29	7.22
Mean NPRS at Follow-Up	1.71	4.88
Mean Difference	3.58	2.34
.

Notes: NDI = Neck Disability Index; NPRS = Numeric Pain Rating Scale; CEN = Centralization; Non-CEN = Non-Centralization; p-value NDI Difference Score = 0.24; p-value NPRS Difference score = 0.47; 10.5% of CEN data were missing

The Mean Difference was calculated by subtracting the mean change in the first examination outcome measure (i.e. the NDI or NPRS) from the mean change in the follow-up measure (first examination mean change minus follow-up mean change = Mean Difference)