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Table 5 Rasch Analysis of the Domain Scores

From: The Valued Life Activities Scale (VLAs): linguistic validation, cultural adaptation and psychometric testing in people with rheumatic and musculoskeletal diseases in the UK

  Condition and number of items Chi- Square* Df P Residual Item Residual Person PSI Reliability % tests > 5% 95% CI N of cases/items
      Mean SD Mean SD     
  Rheumatoid Arthritis            336
1 Obligatory 31.6 25 0.171 −0.0025 0.7371 −0.3163 0.8669 0.79 1.84 0.0–4.2 5
2. Committed 41.3 40 0.415 −0.3659 0.8992 − 0.5156 1.2163 0.88 5.0 2.5–7.3 8
3. Discretionary 59.6 55 0.313 −0.3283 1.1107 −0.3196 0.8450 0.86 4.8 2.4–7.2 11
4 Activities 74.2 65 0.203 −0.3421 1.0915 −0.4057 1.1325 0.91 7.32 5.0–9.7 13
  Ankylosing Spondylitis            165
5 Obligatory 32.5 35 0.590 −0.4068 0.9407 −0.4738 1.0066 0.70 3.75 1.0–8.5 5
6 Committed 22.4 24 0.558 −0.0942 0.9214 −0.3141 1.0133 0.86 5.63 2.2–9.0 8
7 Discretionary 43.2 33 0.110 −0.3089 1.3239 −0.3631 0.8425 0.82 5.63 2.2–9.0 11
8 Activities 98.7 117 0.888 −0.2960 0.8862 −0.3474 1.0455 0.89 4.94 1.6–8.3 13
  Chronic Pain/FM            194
9 Obligatory 13.7 20 0.846 −0.0021 0.6141 −0.4108 1.1276 0.86 4.49 1.1–7.9 5
10 Committed 19.8 24 0.708 −0.2349 1.0388 −0.4173 1.1389 0.90 5.35 2.2–8.5 8
11 Discretionary 45.0 33 0.079 −0.4593 1.6245 −0.3326 0.9164 0.87 4.32 1.2–7.5 11
12 Activities 62.2 39 0.010 −0.2450 0.9657 −0.2855 1.1148 0.94 8.95 5.8–12.0 13
  Chronic HUL            157
13 Obligatory 18.7 15 0.229 −0.3316 1.2499 − 0.3862 0.7203 0.50 2.65 0.0–6.1 5
14 Committed 26.0 24 0.355 −0.3128 1.5619 −0.4211 0.8959 0.88 7.52 3.8–11.2 8
15 Discretionary 32.8 33 0.475 −0.3164 0.9507 −0.4290 1.0548 0.76 3.42 0.0–6.6 11
16 Activities 50.2 39 0.108 −0.1920 1.5876 −0.3047 0.8493 0.88 7.24 3.8–10.7 13
  Osteoarthritis            184
17 Obligatory 31.1 15 0.009 −0.0317 1.2638 −0.2855 0.8517 0.78 2.85 0.0–6.1 5
18 Committed 27.6 24 0.270 −0.3113 0.6352 −0.3043 0.8110 0.87 5.26 1.8–8.7 8
19 Discretionary 49.7 33 0.031 −0.4230 1.2061 −0.3355 0.8260 0.83 5.49 2.2–8.8 11
20 Activities 31.3 39 0.807 −0.3510 0.8760 −0.2667 0.8752 0.91 10.92 7.7–14.2 13
  Systemic Lupus            164
21 Obligatory 15.2 15 0.440 −0.0414 0.5008 −0.3181 0.9331 0.77 3.07 0.0–6.4 5
22 Committed 22.4 24 0.558 −0.3746 0.9971 −0.4169 1.002 0.90 4.91 1.6–8.3 8
23 Discretionary 40.0 33 0.036 −0.3000 1.2608 −0.2669 0.8150 0.84 5.56 2.2–8.9 11
24 Activities 50.1 39 0.110 −0.5035 1.0784 −0.2664 0.9472 0.92 8.59 5.2–11.9 13
  Systemic Sclerosis            170
25 Obligatory 23.4 15 0.075 −0.0035 1.4896 −0.2991 0.8805 0.62 3.00 0.0–6.3 5
26 Committed 25.2 24 0.395 −0.0556 0.8197 −0.3076 0.8682 0.86 3.03 0.0–6.4 8
27 Discretionary 46.2 33 0.063 −0.1914 1.4057 −0.2351 0.7523 0.80 2.45 −0.09-5.8 11
28 Activities 41.6 39 0.358 −0.1652 1.1150 −0.3109 0.9900 0.87 4.85 1.5–8.2 13
  Primary Sjogren’s            171
29 Obligatory 12.2 10 0.273 0.0650 1.2408 −0.1897 0.9149 0.55 1.81 −1.5-5.1 5
30 Committed 31.8 24 0.131 −0.1624 0.9641 −0.4212 0.8971 0.85 2.45 −0.9-5.8 8
31 Discretionary 4.1 33 0.094 −0.1784 1.2859 −0.3196 0.8102 0.74 0.61 −2.7-3.9 11
32 Activities 46.6 39 0.189 −0.4608 1.1457 −0.4803 1.0434 0.86 3.03 0.0–6.4 13
  Ideal Values    > 0.05   < 1.4   < 1.4 > 0.70 < 5.0 LCI < 5.0