. Author manuscript; available in PMC: 2015 Jan 1.

Published in final edited form as: J Anxiety Disord. 2013 Dec 1;28(1):88–96. doi: 10.1016/j.janxdis.2013.11.006

Table 1.

Classical Item Analysis

	Number of Items	N	Cronbach’s Alpha Reliability	Adjusted (corrected for overlap) Item-total Correlation
	Number of Items	N	Cronbach’s Alpha Reliability	Minimum	Mean	Maximum
PROMIS Anxiety	29	743	0.97	0.51	0.73	0.83
MASQ-GA	11	743	0.89	0.43	0.62	0.78
PROMIS & MASQ-GA	40	743	0.98	0.39	0.70	0.83

PROMIS Anxiety	20	748	0.97	0.61	0.79	0.88
GAD-7	7	748	0.93	0.71	0.78	0.85
PROMIS & GAD-7	27	748	0.98	0.60	0.78	0.87

PROMIS Anxiety	15	1120	0.98	0.79	0.84	0.88
PANAS	10	1120	0.95	0.74	0.80	0.84
PROMIS & PANAS	25	1120	0.98	0.70	0.82	0.86