Development of the Knee Quality of Life (KQoL-26) 26-item questionnaire: data quality, reliability, validity and responsiveness

Table 3 Correlation between KQoL-26 scores, EQ-5D, Lysholm Knee Score, SF-36 and days affected by knee problem (n = 559)

	KQoL-26 scales
Variable	Physical functioning	Activity limitations	Emotional functioning
EQ-5D score	.54	.49	.50
Mobility	.52	.49	.35
Self-care	.35	.31	.21
Usual activities	.31	.31	.31
Pain/discomfort	.43	.38	.40
Anxiety/depression	.32	.34	.45
Lysholm Knee Score^a	.76	.76	.58
SF-36:
Physical functioning	.75	.65	.50
Role physical	.54	.61	.55
Bodily pain	.54	.62	.55
General health	.25	.22	.21
Vitality	.43	.44	.48
Social functioning	.57	.66	.60
Role emotional	.47	.52	.56
Mental health	.41	.40	.51
Physical Component Summary	.64	.63	.47
Mental Component Summary	.39	.44	.55
Days off work due to knee	.25	.38	.28
Days normal activity prevented	.38	.46	.43

ISSN: 1477-7525