Table 4.

Component Loadings from the Principal Components Analyses of the Four Rating Scales

Scale	Worst Pain	Least Pain	Average Pain	Current Pain
VAS	0.94	0.92	0.94	0.95
VRS-6	0.91	0.89	0.90	0.92
NRS-11	0.94	0.93	0.94	0.97
FPS-R	0.91	0.91	0.90	0.93
First two eigenvalues	3.43, 0.24	3.32, 0.28	3.40, 0.26	3.55, 0.21

Abbreviations: FPS-R, Face Pain Scale-Revised; NRS, Numerical Rating Scale; VAS, Visual Analogue Scale; VRS, Verbal Rating Scale.