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A nxiety and depression influence the relation between disability status and quality of life in multiple sclerosis

Department of Neurology, Erasmus MC, PO Box 2040, 3000 CA, Rotterdam, the Netherlands, Department of Medical Psychology and Psychotherapy, Erasmus MC, Rotterdam, the Netherlands

P A van Doorn

Department of Neurology, Erasmus MC, PO Box 2040, 3000 CA, Rotterdam, the Netherlands

J B de Boer

Department of Medical Psychology and Psychotherapy, Erasmus MC, Rotterdam, the Netherlands

N F Kalkers

Department of Neurology, VU Medical Center, Amsterdam, the Netherlands

F GA van der Meché

Department of Neurology, Erasmus MC, PO Box 2040, 3000 CA, Rotterdam, the Netherlands

J Passchier

Department of Medical Psychology and Psychotherapy, Erasmus MC, Rotterdam, the Netherlands

R Q Hintzen

Department of Neurology, Erasmus MC, PO Box 2040, 3000 CA, Rotterdam, the Netherlands, rhintzen{at}xs4all.nl

Disability status, depression and anxiety are important determinants of quality of life (Q oL) in patients with multiple sclerosis (MS). We investigated whether anxiety and depression influence the relation between disability status and Q oL in our cohort of recently diagnosed patients. Disability status [Expanded Disability Status Scale (EDSS)], anxiety and depression [Hospital A nxiety and Depression Scale (HADS)], and Q oL (SF-36) were prospectively obtained in 101 MS patients. The relation between EDSS and SF-36 scales was examined using regression analyses, without and with adjustment for anxiety and depression. Interaction effects were investigated by comparing the relation between EDSS and Q oL in patients with high and low anxiety and depression. In the unadjusted analyses, EDSS was significantly related to all SF-36 physical and mental health scales. A fter adjustment for anxiety and depression, EDSS was significantly related only to the SF-36 physical functioning, role-physical functioning and bodily pain scales. The relation between EDSS and these SF-36 scales was consistently higher in patients with more symptoms of anxiety or depression, suggesting that anxiety and depression strengthened the association of EDSS in these SF-36 physical health scales. A fter adjustment for anxiety and depression, EDSS was not significantly related to the SF-36 mental health scales and the general health scale. This finding is compatible with the hypothesis that anxiety and depression are intermediate factors in the association of EDSS with these SF-36 scales. Screening for symptoms of anxiety and depression is recommended in studies that use Q oL as an outcome measure of treatment or intervention efficacy.

Key Words: anxiety • depression • disability • multiple sclerosis • quality of life

Multiple Sclerosis, Vol. 9, No. 4, 397-403 (2003)
DOI: 10.1191/1352458503ms930oa


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