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Table 3 Item characteristics (difficulties and discrimination) for MAPLe-RA scale

From: Psychometric properties of a new treatment expectation scale in rheumatoid arthritis: an application of item response theory

  Item discriminations Item difficulties
Items Estimate (SE) P-value Estimate (SE) P-value
Physical domain     
Swelling of the joints 1.38 (0.58) 0.018 −1.22 (0.30) <0.001
Pain 1.74 (0.82) 0.034 −1.25 (0.30) <0.001
Morning stiffness 1.25 (0.47) 0.008 −1.00 (0.25) <0.001
Mobility 1.04 (0.41) 0.012 −1.16 (0.31) <0.001
Fatigue 0.87 (0.26) 0.001 −0.96 (0.25) <0.001
Visible signs of RA 0.49 (0.16) 0.002 0.19 (0.24) 0.427
Joint damage 0.40 (0.15) 0.006 −0.62 (0.34) 0.066
Psycho-social domain     
Maintain my independence 1.46 (0.39) <0.001 −0.14 (0.13) 0.270
Improvements in my general health 0.85 (0.23) <0.001 0.06 (0.17) 0.712
Everyday activities 1.27 (0.40) 0.001 −0.32 (0.14) 0.027
To feel in control of my RA self-manage 1.64 (0.49) 0.001 −0.46 (0.13) 0.001
To maintain my social roles 1.87 (0.63) 0.003 −0.30 (0.12) 0.016
My emotional well-being 1.77 (0.51) 0.001 −0.42 (0.13) 0.001
Impact of new Treatment     
Feel better overall 1.47 (0.38) <0.001 −1.02 (0.20) <0.001
Reduce the likelihood of surgery 0.89 (0.27) 0.001 −1.19 (0.29) <0.001
To prevent other physical complications 0.70 (0.27) 0.008 −1.47 (0.44) 0.001
To come with detailed information from the
medical staff
1.16 (0.45) 0.010 −1.36 (0.34) <0.001
Decision making with the clinical staff 0.87 (0.34) 0.010 −1.65 (0.47) <0.001
Regular physical assessment 1.41 (0.52) 0.007 −1.36 (0.29) <0.001
Regular emotional well-being 0.81 (0.26) 0.001 −0.90 (0.25) <0.001
Not to have to change medication 0.52 (0.18) 0.005 −1.14 (0.40) 0.004
  1. p-value is for the two parameter model
  2. SE standard error