TABLE 4.

Bivariate Pearson r correlations among numerical rating scale (NRS), coloured analogue scale (CAS) and Facial Affective Scale (FAS) scores for current, lowest, usual and strongest pain

	NRS			CAS				FAS
	Lowest	Usual	Strongest	Current	Lowest	Usual	Strongest
NRS current	0.80**	0.37**	0.10	0.58**	0.50**	0.43**	0.26**	0.16
NRS lowest		0.44**	0.12	0.50**	0.68**	0.41**	0.22*	0.18
NRS usual			0.56**	0.56**	0.59**	0.58**	0.42**	0.41**
NRS strongest				0.40**	0.30**	0 .47**	0.58**	0.43**
CAS current					0.71**	0.65**	0.48**	0.42**
CAS lowest						0.62**	0.30**	0.36**
CAS usual							0.68**	0.49**
CAS strongest								0.46**

Bolded values indicate NRS-CAS correlations to assess convergent validity.

^*P<0.05;

^**P<0.01