[Psychometric attributes of the Scales for Outcomes in Parkinson's Disease-Psychosocial (SCOPA-PS): validation in Spain and review].

Jun 27, 2009Revista de neurologia

Testing the reliability of Parkinson's disease social and psychological outcome scales in Spain

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Abstract

A multi-centre, cross-sectional study involving 387 patients with Parkinson's disease found the SCOPA-PS scale to be reliable and valid.

The SCOPA-PS summary index showed no ceiling or floor effect.
Internal consistency was satisfactory, with a reliability score of 0.85.
Two underlying factors accounted for 53.5% of the variance in responses.
High correlations were observed between SCOPA-PS and measures of anxiety, motor function, and overall health status.
The SCOPA-PS effectively distinguished between patients based on disease severity, age, and duration of illness.
The standard error of measurement was noted to be 7.24 +/- 18.7.

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AIMS: To evaluate the psychometric attributes of the Scales for Outcomes in Parkinson's Disease-Psychosocial (SCOPA-PS) in Spain and to compare them with previous studies.

PATIENTS AND METHODS: We performed a multi-centre, cross-sectional study of 387 patients with Parkinson's disease (PD), 70% of whom were in Hoehn and Yahr (HY) stages 2 or 3, with a mean age of 65.8 +/- 11.1 years and 8.1 +/- 6 years' progression. The following measures were applied: SCOPA-Motor, SCOPA-Cognition, modified Parkinson's Psychosis Rating Scale, Clinical Impression of Severity Index for Parkinson's Disease (CISI-PD), Cumulative Illness Rating Scale-Geriatrics, SCOPA-Autonomic, SCOPA-Sleep, Hospital Anxiety and Depression Scale (HADS), Fatigue and Pain Visual Analogue Scales, EQ-5D and SCOPA-PS. Acceptability, internal consistence, dimensionality, construct validity and precision of the SCOPA-PS were analysed.

RESULTS: The SCOPA-PS summary index displayed no ceiling or floor effect. Internal consistence was satisfactory (alpha = 0.85; item-total correlation => 0.39). Two factors were identified (53.5% of the variance). The SCOPA-PS was highly correlated (r(S) => 0.5) with the HADS, SCOPA-Motor, SCOPA-Automatic and EQ-5D index, and moderately so (r(S) = 0.35-0.49) with CISI-PD, fatigue and HY. The SCOPA-PS discriminated significantly between patients grouped according to HY stages, levels of severity of the CISI-PD, age groups and length of time with PD. The standard error of the measure was 7.24 +/- 18.7. As a whole, these findings are in agreement with previous studies.

CONCLUSIONS: The SCOPA-PS is a scale with a satisfactory degree of acceptability, and it is consistent, valid and precise for evaluating the psychosocial impact of PD.

[Psychometric attributes of the Scales for Outcomes in Parkinson's Disease-Psychosocial (SCOPA-PS): validation in Spain and review].

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