Table 1.

Correlations among Selected IDAS Items (Overall Standardized Sample)

Paraphrased Item	1	2	3
Model 1 – Sleep problems, AIC = .46
1. Slept less than usual	—
2. Had trouble falling asleep	.45	—
3. Woke up earlier than usual	.36	.34	—
4. Slept very poorly	.54	.61	.45
Model 2 – Depression, AIC = .31
1. Felt depressed	—
2. Did not have much of an appetite	.34	—
3. Woke up earlier than usual	.26	22	—
4. Took a lot of effort to get going	.50	.25	.24
Model 3 – Internalizing, AIC = .29
1. Felt dizzy or lightheaded	—
2. Little things made me mad	.32	—
3. Woke up earlier than usual	.24	.24	—
4. Was difficult to make eye contact	.31	.36	.24

Note. N = 8,305. IDAS-II = Expanded version of the Inventory of Depression and Anxiety Symptoms. AIC = Average interitem correlation. Target item is bolded.