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Table 2 Item content and statistics, 49-item disease-specific QOL impact bank

From: Standardizing disease-specific quality of life measures across multiple chronic conditions: development and initial evaluation of the QOL Disease Impact Scale (QDIS®)

Ordera Areab Abbreviated Contentc N Mean (SD) rd ae b Rangee Fitf Imax at Θg CATh
1** QL Everyday activity, QOLi 5399 1.80 (1.04) .956 3.55 0.18–2.11 191.9 6.26 (1.20) 100
44 QL Activity enjoyment lifei 4044 1.79 (1.03) .946 2.63 0.20–2.28 151.0 4.20 (1.10) 0
2** HO Worry health future 5372 2.11 (1.13) .844 1.49 −0.10–1.86 371.9 1.90 (1.35) 42
36* HO Concern worry 4022 1.90 (1.08) .868 1.84 0.13–1.97 284.2 2.65 (1.55) 28
10** PF Usual physical activities 4019 1.96 (1.12) .920 3.10 0.00–1.93 158.2 4.76 (1.45) 55
3* PF Physical activity walking 5386 1.95 (1.20) .876 2.20 0.25–1.64 148.5 4.11 (1.15) 0
47* MB Stay inside house 4008 1.57 (1.04) .894 2.41 0.87–1.94 132.5 5.60 (1.20) 0
27** RL Work daily activities 4015 1.87 (1.09) .964 5.30 0.08–1.89 114.4 9.67 (1.40) 64
5* RL Everyday activities 5381 1.77 (1.06) .957 4.67 0.26–1.96 101.6 8.64 (1.50) 41
15* RL Get done work home 4026 1.91 (1.14) .940 3.88 0.11–1.83 123.6 6.97 (1.50) 14
17* RL Cancel work activity 4015 1.42 (0.85) .921 3.47 0.88–2.17 71.9 7.46 (1.95) 2
23* RL Limited usual activities 4006 1.77 (1.04) .948 4.50 0.20–1.97 89.2 8.70 (1.65) 14
26* RL Accomplished less 5395 1.97 (1.16) .937 3.88 0.07–1.78 85.9 6.94 (1.40) 28
30* RL Leisure activities 4017 1.35 (0.75) .873 2.47 1.05–2.49 152.9 4.35 (2.15) <1
33* RL Productive work other 4012 1.54 (1.00) .945 4.12 0.72–1.96 44.9 9.81 (1.00) 26
49* RL Daily work in and out 3995 1.84 (1.09) .954 4.52 0.14–1.88 101.5 8.73 (1.60) 34
8 RL Daily tasks help 4020 1.72 (1.06) .856 1.93 0.55–1.94 183.1 3.37 (1.35) 0
13 RL Usual daily activitiesj 4020 1.73 (1.01) .941 4.14 0.25–2.14 107.0 7.12 (1.30) 0
19 RL Stop work other activity 4012 1.75 (1.02) .911 3.09 0.27–2.05 89.1 5.38 (1.75) 0
35 RL Simple tasks hard 4006 1.81 (1.08) .923 3.58 0.22–1.93 104.6 6.48 (1.60) 0
38 RL Keep from traveling 4017 1.46 (0.97) .916 2.42 1.11–1.95 177.0 6.32 (1.30) 0
41 RL Restrict recreational 4014 1.48 (0.90) .897 2.64 0.87–2.17 122.5 5.04 (1.20) 0
42 RL Cut down amount time 4011 1.68 (1.04) .942 3.97 0.43–1.97 72.7 7.73 (1.70) <1
6** SA Social family friends 5383 1.56 (0.96) .950 4.56 0.57–2.04 107.1 9.69 (1.75) 30
37* SA Enjoying social activities 4007 1.60 (0.98) .945 4.34 0.52–2.08 93.3 8.29 (1.65) 19
45* SA Hard to get along with 4006 1.52 (0.87) .853 2.05 0.75–2.43 208.3 3.26 (1.65) <1
9 SA Enjoyment family friends 4020 1.63 (0.98) .915 3.05 0.50–2.19 93.0 5.16 (0.90) 0
14 SA Avoid social activities 5399 1.55 (0.97) .938 3.59 0.68–2.12 67.9 7.52 (1.00) 0
21 SA Uncomfortable people 4015 1.43 (0.85) .890 2.57 0.93–2.09 135.7 5.54 (1.85) 0
32 SA Travel take trip 4012 1.52 (1.02) .915 2.48 0.98–1.82 75.8 6.53 (1.30) 0
40 SA Family social leisurek 4015 1.40 (0.80) .920 3.33 0.92–2.60 81.8 6.73 (1.10) 1
4** FT Worn out, tired 5384 1.94 (1.13) .923 3.41 0.06–1.81 96.5 6.17 (1.45) 19
28* FT Bed most of day 4018 1.30 (0.73) .878 2.37 1.34–2.42 124.8 5.23 (1.60) <1
18 FT Need lie down rest 4012 1.92 (1.12) .884 2.44 0.16–1.92 124.9 3.71 (0.55) 0
46 FT Too tired to workj 4007 1.70 (0.98) .932 4.01 0.26–2.22 107.4 6.70 (1.35) <1
20* SL Good night sleep 5387 1.94 (1.14) .810 1.52 0.31–1.86 294.0 2.27 (1.15) 26
11** EM Frustrated fed up 4011 2.03 (1.21) .871 1.99 0.14–1.74 209.3 3.12 (0.70) 36
7* EM Bothered emotionally 5378 1.67 (1.00) .906 2.04 0.53–2.00 117.4 3.71 (1.60) 0
16* EM Interest enjoyment 4018 1.81 (1.07) .940 4.26 0.20–2.01 110.6 7.19 (0.60) 17
22 EM Losing control life 4006 1.56 (0.97) .898 2.35 0.78–1.99 89.0 4.40 (1.70) 0
24 EM Tense feel anxious 4007 1.67 (0.99) .895 2.37 0.46–2.07 107.1 4.07 (1.70) 0
29 EM Fed up frustratedj 4032 1.68 (0.99) .895 2.39 0.39–2.14 167.8 4.29 (1.45) 0
31 EM Letting others down 4019 1.58 (1.03) .914 2.86 0.78–1.89 64.1 6.42 (1.05) 0
34 EM Angry act irritable 4001 1.63 (0.98) .885 2.09 0.61–2.03 111.8 3.71 (1.65) 0
39 EM Feel desperate 4009 1.38 (0.82) .904 2.43 1.08–2.25 114.5 5.25 (1.60) 0
43 EM Depressed sad 5388 1.62 (0.99) .911 2.04 0.71–1.98 134.1 3.84 (1.50) 0
25* CG Difficult to focus 4009 1.53 (0.89) .921 3.38 0.60–2.20 91.7 6.63 (1.95) <1
12 CG Focus on work 4010 1.74 (1.02) .927 3.68 0.29–2.09 51.6 6.24 (1.70) 0
48 CG Ability to concentratej 4004 1.51 (0.86) .923 3.66 0.60–2.36 69.3 6.48 (2.05) 3
  1. aOriginal order of administration in 49-item bank. *In 25-item bank. **In 25-item bank and 7-item short-form
  2. bContent area: QL = quality of life, HO = health outlook, PF = physical functioning, MB = mobility, RL = role functioning, SA = social activity, FT = fatigue, SL = sleep, EM = emotional, CG = cognitive
  3. cAll items used 5-choice (Never-Very often) categorical rating scale except: i5-choice (Not at all-Extremely) scale; jCross-calibration item used 5-choice (None-All of the time) and (Never-Very often) scales in different waves; kItem used 5-choice (Never-Always) scale
  4. dCorrelation with factor in 1-factor confirmatory factor analysis, all diseases combined (N = 3152)
  5. eSlope (a) and range of thresholds (b) in IRT model, all diseases combined
  6. fS-X 2 fit statistic, values above 118.75 are significant at a .05 level
  7. gImax at Θ is maximum of the item information function (first number) at a particular theta (number in parentheses)
  8. hPercentage of times item utilized in 6-item real-data CAT simulation using 49-item bank. Item QL1 was the start item for the CAT