Validating a quality of life rating scale for idiopathic parkinsonism: Parkinson's Impact Scale (PIMS) |
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Authors: | Calne S Schulzer M Mak E Guyette C Rohs G Hatchard S Murphy D Hodder J Gagnon C Weatherby S Beaudet L Duff J Pegler S |
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Affiliation: | Neurodegenerative Disorders Centre, University of British Columbia, Vancouver, Canada. |
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Abstract: | The signs and symptoms of idiopathic parkinsonism (IP, Parkinson's disease) are most commonly documented using one or more rating scales that assess physical limitations due to illness and drug side-effects with some attention being paid to depression. Scant attention has been paid to the impact of these limitations on a patient's life. Nurses in the Parkinson Foundation of Canada Clinical Assistance/ Outreach Programmes have designed a Quality of Life Rating Scale (Parkinson's Impact Scale, PIMS) to measure the impact of IP on 10 aspects of a patient's emotional, social and economic life. The scale had to fit onto one side of an 8 x 11 in. piece of paper, take a patient less than 10 min to complete, take fluctuations in symptoms ('on/off' attacks) into account, have unambiguous guidelines for the definition of each item, and a simple scoring system. A study was carried out to assess the reliability and validity of the scale. Nurses in nine Movement Disorder Clinics and one Outreach Programme participated. A total of 167 patients were asked to use the scale on three separate occasions, 1 month apart, without referring to the scores they had assigned to the scale in the previous month. Factor analysis identified four factors among the items in the scale: psychological, social, physical and financial. Internal consistency was 89.8% and the test-retest reliability was 72%. Construct validity was assessed by comparing factor scores and a global score between non-fluctuating patients and fluctuating patients in their 'off' state. The scores were significantly higher in the more severe 'off' state (p < 0.0001). |
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