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The 6-item CTS symptoms scale: a brief outcomes measure for carpal tunnel syndrome.

Atroshi, Isam LU ; Lyrén, Per-Erik and Gummesson, Christina LU (2009) In Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation 18. p.347-358
Abstract
OBJECTIVE: To develop a psychometrically appropriate brief symptoms measure of carpal tunnel syndrome (CTS). METHODS: Preoperative CTS 11-item symptom severity and 8-item functional status scales from 693 patients (71% women) with CTS were subjected to exploratory factor analysis and item response theory (IRT) analysis yielding a revised CTS symptoms scale. A validation sample of 213 patients (68% women) with CTS completed the 11-item disabilities of the arm, shoulder and hand (QuickDASH), and the revised symptoms scale and 116 patients also completed the original CTS symptom severity scale (median interval 11 days). RESULTS: Of the 11 CTS symptom severity scale items, 2 items that on factor analysis associated with the functional status... (More)
OBJECTIVE: To develop a psychometrically appropriate brief symptoms measure of carpal tunnel syndrome (CTS). METHODS: Preoperative CTS 11-item symptom severity and 8-item functional status scales from 693 patients (71% women) with CTS were subjected to exploratory factor analysis and item response theory (IRT) analysis yielding a revised CTS symptoms scale. A validation sample of 213 patients (68% women) with CTS completed the 11-item disabilities of the arm, shoulder and hand (QuickDASH), and the revised symptoms scale and 116 patients also completed the original CTS symptom severity scale (median interval 11 days). RESULTS: Of the 11 CTS symptom severity scale items, 2 items that on factor analysis associated with the functional status items were removed. After IRT recalibrations of the remaining symptom severity scale items, 2 non-fitting items were removed and 2 items were merged creating the 6-item CTS symptoms scale. Factor analysis showed one dominant factor explaining 58% of the variance. Reliability was high (Cronbach alpha = 0.86; IRT person separation reliability = 0.88). No item displayed significant differential item functioning. The 6-item CTS symptoms scale showed strong correlation with the QuickDASH (r = 0.70) and agreement with the original symptom severity scale (ICC = 0.80). CONCLUSION: The 6-item CTS symptoms scale has good reliability and validity and can be used to measure symptom severity and treatment outcome in CTS. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation
volume
18
pages
347 - 358
publisher
Springer
external identifiers
  • wos:000264266400007
  • pmid:19229657
  • scopus:62349132456
ISSN
1573-2649
DOI
10.1007/s11136-009-9449-3
language
English
LU publication?
yes
id
1ab86e51-e37a-4a4f-98ca-af70355d99cb (old id 1302383)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/19229657?dopt=Abstract
date added to LUP
2009-03-03 12:13:28
date last changed
2017-04-23 04:39:29
@article{1ab86e51-e37a-4a4f-98ca-af70355d99cb,
  abstract     = {OBJECTIVE: To develop a psychometrically appropriate brief symptoms measure of carpal tunnel syndrome (CTS). METHODS: Preoperative CTS 11-item symptom severity and 8-item functional status scales from 693 patients (71% women) with CTS were subjected to exploratory factor analysis and item response theory (IRT) analysis yielding a revised CTS symptoms scale. A validation sample of 213 patients (68% women) with CTS completed the 11-item disabilities of the arm, shoulder and hand (QuickDASH), and the revised symptoms scale and 116 patients also completed the original CTS symptom severity scale (median interval 11 days). RESULTS: Of the 11 CTS symptom severity scale items, 2 items that on factor analysis associated with the functional status items were removed. After IRT recalibrations of the remaining symptom severity scale items, 2 non-fitting items were removed and 2 items were merged creating the 6-item CTS symptoms scale. Factor analysis showed one dominant factor explaining 58% of the variance. Reliability was high (Cronbach alpha = 0.86; IRT person separation reliability = 0.88). No item displayed significant differential item functioning. The 6-item CTS symptoms scale showed strong correlation with the QuickDASH (r = 0.70) and agreement with the original symptom severity scale (ICC = 0.80). CONCLUSION: The 6-item CTS symptoms scale has good reliability and validity and can be used to measure symptom severity and treatment outcome in CTS.},
  author       = {Atroshi, Isam and Lyrén, Per-Erik and Gummesson, Christina},
  issn         = {1573-2649},
  language     = {eng},
  pages        = {347--358},
  publisher    = {Springer},
  series       = {Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation},
  title        = {The 6-item CTS symptoms scale: a brief outcomes measure for carpal tunnel syndrome.},
  url          = {http://dx.doi.org/10.1007/s11136-009-9449-3},
  volume       = {18},
  year         = {2009},
}