Table 3.

Person reliability, Information function reliability, Cronbach alphas, and floor and ceiling effects in full sample (N=681) and ICCs and MDCs in test-retest sample (N=40).

	PROMIS-13 UE AMP	PROMIS-7 UE AMP	PROMIS-6 UE AMP	HMSS PROMIS-13 UE	HMSS PROMIS-7 UE	HMSS PROMIS-6 UE
Person Reliability (Rasch)	0.87	0.78	0.75
Score range with reliability>0.8	25.6, 64.1	34.9, 57.3	36.0, 58.4
% with reliability>0.8	91.4%	70.4%	72.1%
Cronbach alpha	0.90	0.84	0.82
N (%) at Floor	5 (0.7)	7 (1.0)	19 (2.8%)	5 (0.7)	7 (1.0)	19 (2.8%)
N (%) at Ceiling	13 (1.9)	39 (5.7)	37 (5.4)	13 (1.9)	39 (5.7)	37 (5.4)
ICC (95%CI)	0.79 (0.63–0.88)	0.68 (0.47–0.82)	0.83 (0.69–0.90)	0.70 (0.47–0.84)	0.70 (0.50–0.83)	0.85 (0.73–0.92)
MDC90	11.9	15.7	11.1	10.4	12.1	9.0
MDC95	14.2	18.7	13.2	12.4	14.4	10.7

^*Abbreviations: AMP: Amputation-specific, CI: confidence interval, HMSS: Health Measure Scoring System, ICC: intraclass correlation coefficient, MDC: minimal detectable change, PROMIS: Patient-Reported Outcomes Measurement Information System, UE: Upper Extremity.