Evidence-based guidelines for using the Short Form 36 in cervical dystonia.
We aimed to provide evidence-based guidelines for using the Short Form 36 (SF-36) as an outcome measure in cervical dystonia (CD). To do this, we tested the hypothesized relationships between items, scales, and summary measures of the SF-36 using psychometric analyses in data from a postal survey of 235 people with CD. Although the majority of subscales performed adequately, the Role Physical and Role Emotional subscales had substantial floor and/or ceiling effects. Evidence did not support computing SF-36 Physical and Mental Component Summary scores. We propose guidelines that include the recommendation that these subscale and summary scores should be reported with caution.
Cano
Stefan J
SJ
Neurological Outcomes Measures Unit, Institute of Neurology, University College London, United Kingdom.
Thompson
Alan J
AJ
Bhatia
Khailash
K
Fitzpatrick
Ray
R
Warner
Thomas T
TT
Hobart
Jeremy C
JC
D000368:Aged; D019317:Evidence-Based Medicine; D005260:Female; D017408:Guidelines as Topic / Q000592:standards*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D012720:Severity of Illness Index; D014103:Torticollis / Q000175:diagnosis*