Table IV.

Correlations with change in Oxford Knee Score (OKS) at six months; external responsiveness

PROMs 1	PROMs 2	n	Correlation (r)	95% CI	p-value
Change in OKS	Change in EQ-5D	649	0.51	0.45 to 0.57	< 0.001
	Change in EQ-5D VAS	647	0.30	0.24 to 0.37	< 0.001
	Change in PROMIS Physical Health	674	0.57	0.51 to 0.62	< 0.001
	Change in PROMIS Mental Health	648	0.14	0.06 to 0.22	< 0.001

PROMs, patient-reported outcome measures; CI, confidence interval; EQ-5D; EuroQol 5 dimensions; VAS, visual analogue scale; PROMIS, Patient-Reported Outcomes Measurement Information System