Table 5. PROMIS anxiety short form item set: Item response theory (IRT) reliability estimates at varying levels of the attribute (theta) estimate based on results of the IRT analysis (IRTPRO) for the total sample and demographic subgroups.

Anxiety (Theta)	IRT Reliability
	Total	F	M	Age 21-49	Age 50-64	Age 65-84	NH W	NHB	Hisp.	NH API	<HS	HS	Some Coll.	Coll.	Grad.	Lang. Engl.	Lang. Span.
-1.6	0.58	0.63	0.54	0.70	0.55	0.54	0.56	0.55	0.68	0.57	0.66	0.50	0.57	0.55	0.56	0.64	0.78
-1.2	0.74	0.80	0.63	0.86	0.69	0.64	0.70	0.69	0.85	0.73	0.84	0.51	0.72	0.67	0.69	0.82	0.90
-0.8	0.90	0.92	0.83	0.95	0.87	0.83	0.87	0.88	0.94	0.90	0.95	0.53	0.89	0.85	0.85	0.93	0.96
-0.4	0.96	0.97	0.94	0.97	0.95	0.94	0.95	0.96	0.98	0.97	0.98	0.59	0.96	0.95	0.94	0.97	0.98
0.0	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.75	0.98	0.98	0.97	0.98	0.98
0.4	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.91	0.98	0.98	0.97	0.98	0.98
0.8	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.97	0.98	0.98	0.98	0.98	0.98
1.2	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98
1.6	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98
2.0	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.98	0.97	0.98	0.98	0.98	0.98	0.98	0.97
2.4	0.97	0.97	0.98	0.94	0.97	0.98	0.98	0.96	0.93	0.98	0.90	0.98	0.98	0.98	0.97	0.94	0.90
2.8	0.90	0.89	0.93	0.83	0.89	0.96	0.96	0.86	0.79	0.93	0.75	0.98	0.92	0.97	0.98	0.82	0.74
Overall (Average)	0.91	0.92	0.89	0.93	0.90	0.90	0.91	0.90	0.92	0.91	0.91	0.98	0.91	0.90	0.90	0.92	0.93

Note: Reliability estimates were calculated for theta levels for which there are respondents

NHW = Non-Hispanic Whites; NHB = Non-Hispanic Blacks; Hisp. = Hispanic; NHAPI = Non-Hispanic Asians/Pacific Islanders

Coll. = college; Lang. = language; Engl. = English; Span. = Spanish