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. 2016 Oct 9;2:2055217316673235. doi: 10.1177/2055217316673235

Table 2.

(a) Graded response model item parameters and fit statistics for MSIS-29v1 Physical and Psychological Impact Subscales—baseline.

Category thresholda
 Item fit statisticsb
Number Descriptor Slopea β1 β2 β3 β4 S-G2 S-G2 p value S-X2 S-X2 p value
Physical Subscale
Q1 Do physically demanding tasks 3.11 −0.90 0.07 0.94 2.28 50.02 0.4724 50.65 0.4477
Q2 Grip things tightly 2.07 0.15 0.97 1.98 3.31 26.60 0.9868 26.85 0.9855
Q3 Carry things 2.27 −0.46 0.42 1.35 2.23 48.36 0.4988 42.43 0.7349
Q4 Problems with balance 2.47 −0.84 0.15 0.96 2.11 41.42 0.8533 41.62 0.8480
Q5 Difficulties moving about indoors 2.97 −0.03 0.84 1.82 2.85 25.69 0.9875 24.90 0.9910
Q6 Being clumsy 2.79 −0.52 0.51 1.46 2.28 35.81 0.8344 34.47 0.8726
Q7 Stiffness 2.36 −0.26 0.62 1.62 2.87 52.59 0.3369 49.40 0.4570
Q8 Heavy arms and/or legs 2.44 −0.70 0.30 1.23 2.39 43.30 0.7698 40.97 0.8413
Q9 Tremor of arms/legs 1.84 −0.20 0.84 1.77 2.97 41.15 0.7473 38.77 0.8267
Q10 Spasms in limbs 1.73 −0.07 0.90 1.81 3.21 43.52 0.6940 44.30 0.6639
Q11 Body not doing what you want it to do 2.48 −0.08 0.89 1.53 2.59 43.09 0.5530 42.05 0.5977
Q12 Having to depend on others to do things for you 3.38 0.16 0.85 1.44 2.14 16.95 1.0000 16.60 1.0000
Q13 Limitations in social/leisure activities at home 2.78 −0.06 0.94 1.74 2.94 28.67 0.9839 26.95 0.9917
Q14 Being stuck at home more than would like 2.33 −0.08 0.72 1.36 2.25 35.49 0.8688 34.02 0.9044
Q15 Difficulties using hands in everyday tasks 2.52 0.13 0.91 1.77 2.60 49.29 0.3055 47.04 0.3891
Q16 Having to cut down time spent on work/daily activities 2.75 −0.37 0.50 1.47 2.45 45.95 0.5976 45.46 0.6173
Q17 Problems using transport 2.75 0.12 0.85 1.55 2.33 41.60 0.6949 39.22 0.7829
Q18 Taking longer to do things 3.44 −0.54 0.42 1.21 2.37 25.91 0.9900 25.42 0.9918
Q19 Difficulty doing things spontaneously 2.54 −0.03 0.68 1.35 2.17 24.42 0.9963 23.17 0.9980
Q20 Needing to go to the toilet urgently 1.69 −0.11 0.77 1.51 2.50 55.23 0.2838 51.46 0.4162
Psychological subscale
Q1 Feeling unwell 2.25 −0.66 0.54 1.57 2.74 34.16 0.7298 33.16 0.7695
Q2 Problems sleeping 1.44 −0.15 1.09 1.87 2.86 47.59 0.2914 51.88 0.1663
Q3 Mentally fatigued 2.60 −0.45 0.54 1.34 2.37 51.65 0.1026 49.66 0.1407
Q4 Worries about our MS 1.89 −1.18 0.25 1.14 2.19 49.98 0.1588 47.65 0.2204
Q5 Anxious or tense 3.39 −0.64 0.44 1.25 2.18 47.64 0.0929 47.24 0.0994
Q6 Irritable, impatient, or short-tempered 2.62 −0.71 0.25 1.21 2.22 28.61 0.8649 29.37 0.8412
Q7 Problems concentrating 2.75 −0.54 0.50 1.35 2.44 39.68 0.3516 37.91 0.4277
Q8 Lack of confidence 3.09 −0.38 0.63 1.43 2.19 30.13 0.7024 29.00 0.7522
Q9 Feeling depressed 3.20 −0.15 0.83 1.59 2.40 28.26 0.8485 26.58 0.8978
a

Using IRT software MULTILOG. bUsing SAS macros IRTFIT. MSIS-29v1: Multiple Sclerosis Impact Scale.