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 |