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Table 3 Functional rating scales addressing difficulty and frequency attributes

From: The importance of rating scales in measuring patient-reported outcomes

Attributeunderassessment

Questionnaire(Questionnumber)

Number ofcategories

Categorieslabelled

Orderedthresholds/Number ofthresholds

Scalerange(logits)

Width of eachcategory (logits)

Standarddeviation

Misfittingitems/Total items

Difficulty

        
 

VSQ (1,6,8,9)

5

✓

4/4

6.50

2.56, 1.13, 2.81

0.91

0/4

 

CSScale (1–10)

5

✓

4/4

3.97

1.53, 0.45, 1.99

0.79

0/10

 

TyPE (2–13)

5

✓

4/4

3.67

1.03, 0.36, 2.28

0.97

1/18

 

NEIVFQ (5–16, A3-A9)

5

✓

4/4

3.65

1.14, 1.20, 1.31

0.09

1/19

 

VF-14 (1–12)

5

✓

4/4

7.22

3.91, 2.12, 1.19

1.38

4/12

 

VSQ (3,5,7,VS4)

5

✓

4/4

4.59

2.77, 1.63, 0.19

1.29

0/4

 

VF&QOL (2–15c)

4

✓

3/3

5.04

2.67, 2.37

0.21

0/2

 

VDA (1–18)

4

✓

3/3

4.05

2.22, 1.83

0.28

0/18

 

Catquest (7–14, 16,17, 24)

4

✓

3/3

2.90

2.54, 0.36

1.54

0/11

 

QOLVFQ (1–17)

3

✓

2/2

3.54

3.54

–

0/17

 

ICS (3)

3

✓

2/2

2.46

2.46

–

0/1

Frequency

        
 

IVI (20–32)

6

✓

5/5

3.68

0.12, 1.76, 0.58, 1.22

0.72

0/12

 

NEIVFQ (3,17–19, A11a and b)

5

✓

4/4

3.58

0.69, 1.76, 1.13

0.54

1/6

 

VAQ (1–33)

5

✓

4/4

3.55

0.60, 0.09, 0.98

0.45

1/33

 

CSScale (11–15)

5

✓

4/4

2.93

1.01, 0.58, 1.34

0.38

1/5

 

VSQ (4,10–14, VS5)

4

✓

3/3

3.53

3.07, 0.46

1.85

0/6

 

VSQ (VS1)

4

✓

3/3

3.85

2.51, 1.34

0.83

0/1

 

Catquest (1–6, 23)

3

✓

2/2

2.78

2.78

–

4/7

  1. For non-abbreviated name of the PROs, please refer Table 1.
  2. Rating scale labels for above PROs are:
  3. Difficulty
  4. VSQ (1, 6, 8, 9)-No difficulty/yes, a little difficulty/yes, some difficulty/yes, a great deal of difficulty/yes, I cannot perform the activity because of my eyesight; Cataract Symptom Scale (1–10)- No, a little difficulty, a moderate difficulty, very difficult, unable to do; TyPE (2–13)-Not at all, a little bit, some, quite a lot, totally disabled; NEI VFQ (5–16, A3–A9)- No difficulty at all, a little difficulty, moderate difficulty, extreme difficulty, stopped doing this because of eyesight; VF-14 (all)–Yes,No,Not applicable, If yes–a little, a moderate amount, a great deal, unable to do the activity; VSQ (3, 5, 7, VS4)- No, not difficult/yes, a little difficult/yes, quite difficult/yes, very difficult/I cannot perform the activity; VSQ (VS8)-Not at all/a little/quite a lot/a great deal; VF&QOL (2–15c)–Not at all/a little/quite a lot/a lot; VDA (all)–Not at all/a little/quite a bit/a lot; Catquest (7–14, 16, 17, 24)–Yes, extreme difficulty/yes, much difficulty/yes, some difficulty/no, no difficulty; QOLVFQ (1–17)–Not at all, quite a lot, very much; ICS (3)- No problems, some problems, severe problems.
  5. Frequency
  6. IVI (20–32)- Not at all, very rarely, a little of the time, a fair amount of the time, a lot of the time, all the time; NEIVFQ (3, 17–19, A11a, A11b)-None of the time, a little of the time, some of the time, most of the time, all of the time; VAQ (1–33)- Never, rarely, sometimes, often, always; Cataract Symptom Scale (11–15)–No, occasionally, sometimes, most of the time, all of the time; VSQ (4, 10–14, VS5)–No, never/yes, some of the time/yes, most of the time/yes, all of the time; VSQ (VS1)–No, occasionally, sometimes, most of the time, all of the time; Catquest (1–6, 23)–No, Yes/If yes, once a week, at the most 2–4 times a week (approx.), daily.