. Author manuscript; available in PMC: 2016 Nov 1.

Published in final edited form as: Qual Life Res. 2015 Jun 3;24(11):2591–2599. doi: 10.1007/s11136-015-1010-y

Table 5.

Reliability of PROMIS Short Forms

Measure	Cronbach’s Alpha (95% Confidence Interval)		IRT Estimated Marginal Reliability
Measure	Baseline	Follow-up	Baseline	Follow-up
PROMIS Physical Function 10a	0.84 (0.76, 0.89)	0.85 (0.76, 0.93)	0.92	0.91
PROMIS Fatigue 7a	0.91 (0.85, 0.94)	0.77 (0.65, 0.84)	0.91	0.85
PROMIS Depression 8b	0.91 (0.86, 0.95)	0.92 (0.83, 0.97)	0.90	0.73
PROMIS DSA 7a	0.95 (0.92, 0.97)	0.92 (0.86, 0.94)	0.93	0.92

Abbreviation: DSA, Satisfaction With Discretionary Social Activities.