This article refers to:
Measuring fatigue in patients with multiple sclerosis: reproducibility, responsiveness and concurrent validity of three Dutch self-report questionnaires, Rietberg MB, Van Wegen EE, Kwakkel G., Volume 32, No 22, pp 1870–1876
The authors have noticed an error in their published article which has been corrected below:
The final printed version now reads (page 1872, under heading ‘responsiveness’, right column):
“The SEM was calculated by SD× √(1 ( R), with R==ICC and SD==√(total variance) [[De Vet 2006]]”.
Whereas it should read:
“The SEM was calculated by SD× √(1 – R), with R==ICC and SD==√(total variance) [[De Vet 2006]]”.