The Swedish RAND-36: psychometric characteristics and reference data from the Mid-Swed Health Survey

Journal of Patient-Reported Outcomes

Table 3 Internal consistency reliability and range of item-scale correlations (n = 3422)

	Reliability		Range of item-scale correlations
Scale	k^a	Cronbach’s alpha	Item convergent validity^b	Item discriminant validity^c
Physical functioning	10	0.94	0.63–0.85	0.22–0.65
Role-functioning/physical	4	0.91	0.77–0.83	0.35–0.66
Pain	2	0.88	0.81	0.35–0.65
General health	5	0.82	0.50–0.75	0.29–0.66
Energy/fatigue	4	0.85	0.62–0.76	0.31–0.65
Social functioning	2	0.84	0.73	0.44–0.65
Role-functioning/emotional	3	0.84	0.67–0.74	0.31–0.57
Emotional well-being	5	0.84	0.62–0.70	0.21–0.68

^aNumber of items
^bCorrelations between items and hypothesized scale (corrected for overlap)
^cCorrelations between items and other scales This table summarizes data from Appendix 2