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Table 3 Reliability, agreement and smallest detectable change

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

  Cronbach’s αa ICCa SEMagr 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 4.85b 10.9
  1. ICC Intraclass correlation coefficient, SEMagr 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
  2. a95% confidence interval in parentheses
  3. bBeard et al. (2015) [19]