Skip to main content

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