Table 2.

Prevalence of Symptoms, Factor Analysis and IRT Parameter Estimates for Full Bereaved Sample (n=728)

	Prevalence	Factor analysis parametersa						IRT parametersb
		1-factor	2-factors		3-factors			Severity	Discrimination	Imax
		1	1	2	1	2	3
13. I feel that life is empty without the person who died	0.36	0.95	0.95	.	0.92	.	.	0.44	4.20	1.00
19. I feel lonely a great deal of the time ever since he/she died	0.38	0.95	0.95	.	0.92	.	.	0.40	4.03	0.92
8. I feel stunned or dazed over what happened	0.33	0.94	0.89	.	0.91	.	.	0.55	3.45	0.67
3. I feel I cannot accept the death of the person who died	0.32	0.89	0.88	.	0.89	.	.	0.58	3.38	0.65
7. I feel disbelief over what happened	0.36	0.95	0.91	.	0.92	.	.	0.44	3.36	0.64
4. I feel myself longing for the person who died	0.47	0.92	0.93	.	0.90	.	.	0.11	3.32	0.62
1. I think about this person so much, it’s hard to do the things I normally do	0.26	0.86	0.86	.	0.85	.	.	0.77	3.10	0.54
17. I feel bitter over this person’s death	0.28	0.87	0.86	.	0.89	.	.	0.71	2.93	0.49
2. Memories of the person who died upset me	0.42	0.86	0.87	.	0.87	.	.	0.26	2.85	0.46
16. I feel that it is unfair that I should live when this person died	0.17	0.80	0.80	.	0.79	.	.	1.15	2.57	0.37
6. I can’t help feeling angry about his/her death	0.32	0.85	0.84	.	0.86	.	.	0.61	2.54	0.37
10. Ever since he/she died I have lost the ability to care about other people	0.22	0.79	0.79	0.43	0.77	.	0.47	0.99	2.20	0.27
9. Ever since he/she died it is hard for me to trust people	0.24	0.73	0.73	0.41	0.73	.	0.51	1.00	1.83	0.19
15. I see the person who died stand before me	0.04	0.64	0.62	.	0.58	0.53	.	2.44	1.76	0.18
18. I feel envious of others who have not lost someone close	0.22	0.69	0.70	.	0.70	.	.	1.11	1.73	0.17
14. I hear the voice of the person who died speak to me	0.04	0.61	0.60	.	0.55	0.55	.	2.54	1.72	0.17
5. I feel drawn to places and things associated with the person who died	0.26	0.64	0.64	.	0.62	.	.	1.00	1.45	0.12
12. I go out of my way to avoid reminders of the person who died	0.15	0.59	0.59	.	0.60	.	.	1.61	1.41	0.11
11. I have pain in the same area of my body as the person who died	0.07	0.53	0.54	.	0.52	.	.	2.41	1.37	0.11
Test Statistics	Chi-square	671	426		223
	Df	152	134		117
	Pvalue	<.0001	<.0001		<.0001
	RMSEA	0.066	0.053		0.034
	CFI	0.982	0.990		0.996

^aAll factor loadings smaller than 0.40 are suppressed for ease of interpretation.

^bThe Severity parameter represents the location (on the standardized trait scale) where the prevalence of the item is expected to be 0.5 which also corresponds to the location of maximum item information. The Discrimination parameter is directly proportional to the maximum item information (i.e., precision) for measuring the one underlying trait. Imax is the relative item information as compared to the overall most informative item (Q13: I feel that life is empty without the person who died)