Table 4.

Spearman correlation coefficients for different measures of illness severity for different groups

Group	HU ↔ VAS	HU ↔ Own WTP	HU ↔ Insurance WTP	VAS ↔ Own WTP	VAS ↔ Insurance WTP	Own WTP ↔ Insurance WTP
Healthy (n = 126)	−.53***	−.29***	−.15	.22*	.20*	.67***
Low Back Pain (n = 32)	−.31+	−.20	−.10	−.11	−.04	.73***
Total (n = 156)	−.50***	−.30***	−.15+	.18*	.16*	.68***

HU Health Utilities, VAS 100 mm Visual Analogue Scale Values, WTP Willingness to Pay, + = p < .01, * = p < .05, ** = p < .01, *** = p < .001