Table 5.

Sensitivity and Specificity of ICG Items in Complicated Grief Cases vs. Non-cases

	Prevalence in cases (n=288)	Prevalence in non-cases (n=377)	Specificity (1-false positive rate)	Likelihood ratio of test positive
	Sensitivity (true positive rate)	False positive rate
4. I feel myself longing for the person who died	88.5%	9.3%	90.7%	9.5
2. Memories of the person who died upset me	81.9%	7.2%	92.8%	11.4
19. I feel lonely a great deal of the time ever since he/she died	80.9%	2.4%	97.6%	33.9
13. I feel that life is empty without the person who died	80.2%	1.9%	98.1%	43.2
7. I feel disbelief over what happened	76.4%	3.7%	96.3%	20.6
8. I feel stunned or dazed over what happened	71.2%	1.9%	98.1%	38.3
3. I feel I cannot accept the death of the person who died	70.1%	1.9%	98.1%	37.8
6. I can’t help feeling angry about his/her death	64.6%	3.7%	96.3%	17.4
1. I think about this person so much, it’s hard to do the things I normally do	61.1%	1.3%	98.7%	46.1
17. I feel bitter over this person’s death	61.1%	2.1%	97.9%	28.8
9. Ever since he/she died it is hard for me to trust people	49.0%	2.4%	97.6%	20.5
10. Ever since he/she died I have lost the ability to care about other people	47.9%	1.6%	98.4%	30.1
5. I feel drawn to places and things associated with the person who died	46.5%	5.3%	94.7%	8.8
18. I feel envious of others who have not lost someone close	45.1%	2.7%	97.3%	17.0
16. I feel that it is unfair that I should live when this person died	40.6%	0.0%	100.0%	*9999
12. I go out of my way to avoid reminders of the person who died	32.3%	2.4%	97.6%	13.5
11. I have pain in the same area of my body as the person who died	12.8%	1.3%	98.7%	9.7
15. I see the person who died stand before me	10.8%	0.3%	99.7%	40.6
14. I hear the voice of the person who died speak to me	9.7%	0.0%	100.0%	*9999

^*Values of 9999 are given for those cases where the ratio is estimated to be infinite (due to a zero false positive rate in the non-case group).

Likelihood ratio of test positive= sensitivity/(1-specificity).