Table 2.

Standardized Factor Loadings for the 2-Factor Model of the SF-12

	Total Sample (N = 40,647)		Unconstrained Multiple Group Analysis
			History of Stroke (N = 2,581)		No History of stroke (N = 38,066)
SF-12 item:	PHLF	MHLF	PHLF	MHLF	PHLF	MHLF
1. General health	-0.58	-0.12	-0.62	-0.05	-0.57	-0.12
2. Limited in moderate activities	0.75	0	0.71	0	0.75	0
3. Limited in climbing several stairs	0.71	0	0.64	0	0.70	0
4. Accomplished less due to physical health	0.87	0	0.83	0	0.87	0
5. Limited in kind of work	0.92	0	0.89	0	0.92	0
6. Accomplished less due to emotional health	0	0.93	0	0.94	0	0.93
7. Not work as carefully	0	0.94	0	0.94	0	0.93
8. Pain interfere with work	-0.78	0	-0.67	0	-0.78	0
9. Physical/emotional interfere with social	0.56	0.38	0.57	0.33	0.55	0.39
10. Felt calm and peaceful	0	-0.67	0	-0.69	0	-0.67
11. Have a lot of energy	-0.45	-0.35	-0.48	-0.28	-0.44	-0.35
12. Felt downhearted and blue	0	0.74	0	0.76	0	0.74

Note: PHLF = Physical Health Latent Factor; MHLF = Mental Health Latent Factor.

All zero factor loadings were fixed to be zero in the model identification process. All non-zero factor loadings were significantly different from zero (p<.0001), except the loading of the general health item on the MHLF for the stroke history group.

The correlation between PHLF and MHLF was .54 (p<.0001) in the total sample, .59 (p<.0001) in the stroke history group, and .53 (p<.0001) in the non-stroke history group.

Items with negative factor loadings represent those SF-12 questions on which higher scores indicated poorer health status whereas items with positive factor loadings represent the SF-12 questions on which higher scores reflected better health.