Clin Invest Med - August 1997 Vol. 20, No 4 / Table 3: Summary results of tests of item internal consistency and item discriminant validity, and reliability estimates; English-language sample

Readying a US measure of health status, the SF-36, for use in Canada

*Table 3: Summary results of tests of item internal consistency and item discriminant validity, and reliability estimates; English-language sample (n = 120)*
		Item-internal consistency*			Item-discriminant validity†
Scale	No. of items	Range of correlations	Median correlation	Success rate, %‡	Range of correlations	Significant (and total) success rate, %§	Cronbach's alpha
Physical functioning	10	0.41-0.86	0.80	100	-0.03-0.60	84 (100)	0.93
Role physical	4	0.70-0.77	0.72	100	0.21-0.62	69 (100)	0.87
Bodily pain	2	0.81	0.81	100	0.38-0.69	88 (100)	0.90
General health	5	0.32-0.67	0.65	60	0.03-0.71	28 (82)	0.76
Vitality	4	0.58-0.69	0.59	100	0.24-0.62	56 (97)	0.80
Social functioning	2	0.74	0.74	100	0.22-0.64	75 (100)	0.85
Role emotional	3	0.73-0.88	0.87	100	0.07-0.62	100 (100)	0.91
Mental health	5	0.46-0.61	0.58	100	0.10-0.52	72 (100)	0.77
*Correlations between items and hypothesized scale, corrected for overlap. †Correlations between items and scales other than hypothesized scale. ‡Percentage of correlations between items and hypothesized scale that are < or = 0.40. §Percentage of correlations between items and hypothesized scale that are greater than correlations between items and other scales, without regard to significance (standard error of correlation = 0.09).