Comparison between Two Low Doses of Amitriptyline in the Management of Chronic Neck Pain: A Randomized, Double-Blind, Comparative Study

Table 5

Correlations between NPDI, VAS score, and other outcome measures.

Correlation with NPDI	Patient satisfaction	AIS	HAD-A	HAD-D	VAS
Pearson correlation coefficient	0.238	0.248	0.245	0.281	0.861
Value	0.047	0.038	0.041	0.018	<0.001
Correlation with VAS	Patient satisfaction	AIS	HAD-A	HAD-D	NPDI
Pearson correlation coefficient	0.213	0.279	0.241	0.411	0.861
Value	0.076	0.020	0.045	<0.001	<0.001

. . AIS, Athens Insomnia Scale; HAD-A, Hospital Anxiety and Depression Scale – anxiety subscale; HAD-D, Hospital Anxiety and Depression Scale-depression subscale; NPDI, neck pain disability index; VAS, visual analog scale.