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Table 4 Rasch Analysis of Various Versions of the Scale by Condition

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- Squarea Df P Residual Item Residual Person PSI Reliability % tests > 5% 95%CI N
      Mean SD Mean SD     
1 Ankylosing Spondylitis- 33 129.3 66 < 0.001 −0.5876 1.6027 −0.3703 1.0239 0.93 8.02 4.7–11.4 165
2 AS-25 54.0 50 0.324 − 0.4318 1.1425 − 0.3715 1.1252 0.92 7.64 4.2–11.1 165
3 AS-14 24.0 28 0.684 −0.3933 1.3061 − 0.4036 1.0915 0.90 5.73 2.3–9.1 165
4 Rheumatoid Arthritis-33 315.3 165 < 0.001 −0.3128 2.0134 −0.2709 1.0995 0.95 6.67 4.3–9.5 336
5 RA-25 214.2 200 0.233 −0.2082 1.5988 −0.3244 1.1197 0.95 10.64 8.3–13.0 336
6 RA-14 141.5 112 0.031 −0.2118 1.7771 −0.4067 1.1493 0.92 8.51 6.2–10.9 336
7 Chronic Pain −33 210.49 132 < 0.001 −0.2716 1.6226 −0.2152 1.2471 0.96 8.65 5.5–11.8 194
8 CP-25 121.7 100 0.069 −0.2432 1.3791 −0.2654 1.2142 0.96 9.73 6.6–12.9 194
9 CP-14 77.1 56 0.032 −0.1707 1.3792 −0.2721 1.1337 0.93 10.38 7.2–13.5 194
10 Chronic Hand/Upper Limb-33 145.9 66 < 0.001 −0.2638 1.7283 −0.2785 0.9902 0.91 7.95 4.5–11.4 157
11 CH-25 76.0 50 0.010 −0.1936 1.4952 − 0.3153 1.0373 0.91 8.61 5.1–12.1 157
12 CH-14 44.4 28 0.026 −0.1760 1.5444 −0.2875 0.8676 0.88 9.15 5.7–12.6 157
13 Osteoarthritis-33 156.4 99 < 0.001 −0.3829 1.4713 −0.2158 0.8122 0.94 10.92 7.7–14.2 184
14 OA-25 94.5 75 0.063 −0.3394 1.1947 −0.2598 0.8926 0.94 12..07 8.8–15.3 184
15 OA-14 52.3 42 0.133 −0.3406 1.1186 −0.2979 0.9932 0.91 12.07 8.8–15.3 184
16 Systemic Lupus −33 201.5 99 < 0.001 − 0.2439 1.7943 −0.1998 1.1412 0.94 6.17 2.8–9.5 164
17 SLE-25 148.7 75 < 0.001 −0.3171 1.4556 − 0.2224 1.0881 0.94 9.92 6.5–13.2 164
18 SLE-14 67.5 42 0.007 −0.2797 1.3644 −0.3106 1.1546 0.91 10.43 7.1–13.8 164
19 Systemic Sclerosis-33 214.7 99 < 0.001 −0.2154 1.7710 −0.2079 1.0446 0.91 6.21 2.7–9.8 170
20 SS-25 88.4 75 0.139 −0.1269 1.4387 −0.2573 1.0479 0.91 6.45 3.0–9.9 170
21 SS-14 45.7 42 0.321 −0.1567 1.2816 −0.3223 1.0401 0.87 8.43 5.1–11.7 170
22 Primary Sjogren’s-33 255.8 99 < 0.001 −0.3904 1.7979 −0.2317 1.1495 0.90 7.88 4.5–11.2 171
23 PS-25 138.8 75 < 0.001 −0.2100 1.2663 −0.3023 1.1632 0.90 4.85 1.5–8.2 171
24 PS-14 50.5 42 0.173 −0.1771 1.1396 −0.4102 1.1496 0.87 6.21 2.8–9.6 171
  Ideal Values    > 0.05a   < 1.4   < 1.4 > 0.70 < 5.0 LCI < 5.0  
  1. aBonferroni Adjusted (for 33 & 25 items fit is 0.002; for 14 items is 0.004)