Properties of patient-reported outcome measures in individuals following acute whiplash injury

Table 5 Pearson’s (top-right) and Spearman’s (bottom-left) correlations between measures

Pearson (TR)/Intra-class (BL) correlations	EQ-5D (utility)	EQ-5D (VAS)	SF-6D	SF-12 (PCS)	SF-12 (MCS)	NDI
EQ-5D (utility)	N/A	0.676	0.691	0.663	0.601	−0.762
EQ-5D (VAS)	0.694	N/A	0.671	0.609	0.610	−0.628
SF-6D	0.774	0.690	N/A	0.683	0.801	−0.714
SF-12 (PCS)	0.732	0.616	0.672	N/A	0.298	−0.771
SF-12 (MCS)	0.621	0.612	0.807	0.299	N/A	−0.504
NDI	−0.792	−0.600	−0.693	−0.759	−0.464	N/A

Time points were combined and missing data excluded pairwise for each comparison.
*p values were less than 0.001 for all correlations in this table.

ISSN: 1477-7525