Table 4 Functional rating scales addressing severity and global attributes
From: The importance of rating scales in measuring patient-reported outcomes
Attributeunderassessment | Questionnaire(Questionnumber) | Number ofcategories | Categorieslabelled | Number oforderedthresholds/Total number ofthresholds | Scalerange(logits) | Width ofeachcategory(in logits) | Standarddeviation | Misfittingitems/Totalitems |
|---|---|---|---|---|---|---|---|---|
Severity | ||||||||
NEIVFQ (4) | 5 | ✓ | 4/4 | 4.14 | 2.17, 1.43, 0.54 | 0.82 | 0/1 | |
Catquest (15) | 4 | ✓ | 3/3 | 4.65 | 2.07, 2.53 | 0.36 | 0/1 | |
CSS (allquestions) | 4 | ✓ | 3/3 | 2.89 | 1.50, 1.39 | 0.08 | 0/1 | |
VFI (2) | 3 | ✓ | 2/2 | 3.60 | 3.60 | – | 0/1 | |
Global | ||||||||
Global ratingof vision | VSQ (V2, V3) | 8 | ✓ | 7/7 | 7.04 | 2.11, 0.8, 0.82,0.93, 1.00, 1.38 | 0.50 | 2/2 |
Global ratingof vision | VSQ (V1) | 7 (7th categorynot used) | ✓ | 5/5 | 9.11 | 3.09, 1.44, 1.90, 2.68 | 0.75 | 0/1 |
Global rating | VSQ (VS6) | 7 | ✓ | 6/6 | 5.28 | 0.70, 0.26, 1.24,0.36, 2.72 | 1.01 | 0/1 |
Global ratingof vision | NEIVFQ (2) | 6 | ✓ | 5/5 | 10.18 | 3.23, 2.44, 1.38, 3.18 | 0.86 | 0/1 |
Global rating(health) | NEIVFQ (1) | 5 | ✓ | 4/4 | 5.70 | 1.59, 1.89, 2.22 | 0.32 | 0/1 |
Global ratingof vision | TyPE (1) | 5 (5th categorywas not used) | ✓ | 3/3 | 3.89 | 2.62, 1.27 | 0.95 | 0/1 |
Global rating/severity | VF&QOL (1) | 4 | ✓ | 3/3 | 6.20 | 3.36, 2.84 | 0.37 | 0/1 |
VFI (1) | 3 | ✓ | 2/2 | 6.08 | 6.08 | – | 0/1 |