Table 1.

Health-related quality of life measures: definitions and the consistency of multi-item measures

Measures	Definition	Number of Items	Cronbachs's Alphaa
Overall Health	Perception of current health	1	–
Pain	Perception of overall pain	1	–
Physical Functioning	Extent to which health interferes with a variety of activities	6	0.84
Role Functioning	Extent to which health interferes with usual daily activities	2	0.89
Social Functioning	Extent to which health interferes with normal social activities	1	–
Mental Health	General mood or affect, including depression, anxiety, well-being	5	0.85
Energy/Fatigue	Extent to which patient felt fatigued	4	0.87
Cognitive Functioning	Extent to which reasoning or concentration was impaired	4	0.88

^a measure of internal consistency reliability for multi-item scales