Measurement properties of PROMIS short forms for pain and function in total hip arthroplasty patients

Journal of Patient-Reported Outcomes

Table 3 Reliability, agreement and smallest detectable change

	Cronbach’s α^a	ICC^a	SEM_agr	SDC90	\( \frac{\mathbf{mean}\ \mathbf{change}\ \mathbf{score}}{{\mathbf{SEM}}_{\mathbf{agr}}} \)
PROMIS PAIN	0.86 (0.82 to 0.90)	0.77 (0.60 to 0.87)	3.75	8.75	6.4
PROMIS PI	0.93 (0.90 to 0.94)	0.81 (0.67 to 0.89)	2.83	6.61	6.9
PROMIS PF	0.91 (0.88 to 0.93)	0.69 (0.50 to 0.81)	3.60	8.40	4.4
OHS	–	–	2.08	4.85^b	10.9

ICC Intraclass correlation coefficient, SEM_agr Agreement assessed using standard error of measurement, SDC90 Smallest detectable change for individuals that can be considered above the measurement error with a 90% confidence level, PROMIS Patient Reported Measurement Outcome Instrumentation System, PAIN Pain intensity, PI Pain interference, PF Physical function, OHS Oxford Hip Score
^a95% confidence interval in parentheses
^bBeard et al. (2015) [19]