Psychometric properties of the SCOPA‐AUT Brazilian Portuguese version

Nov 26, 2009Movement disorders : official journal of the Movement Disorder Society

Reliability and accuracy of the Brazilian Portuguese SCOPA-AUT questionnaire

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Abstract

The mean score for the SCOPA-AUT was 23.0 +/- 11.2 among 150 evaluated Parkinson's disease patients.

The SCOPA-AUT showed no floor or ceiling effects in the assessed population.
Internal consistency was adequate overall, although the thermoregulatory and cardiovascular domains had lower reliability (alpha coefficients of 0.56 and 0.63, respectively).
The total score of SCOPA-AUT correlated closely with the nonmotor symptoms scale (NMSS) and PD questionnaire (PDQ-39), with correlation coefficients of 0.65 and 0.61, respectively.
A significant increase in SCOPA-AUT scores was observed with advancing Hoehn and Yahr stages (P < 0.0001).
The SCOPA-AUT Brazilian Portuguese version is considered acceptable, reliable, and valid for evaluating autonomic dysfunction in Parkinson's disease.

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Cross-cultural adaptation and psychometric assessment of the Scales for Outcomes in Parkinson's Disease-Autonomic questionnaire (SCOPA-AUT) Brazilian Portuguese version. 150 consecutive Parkinson's disease (PD) patients were evaluated by means of the SCOPA-motor scale (SCOPA-M), SCOPA-cognition (SCOPA-COG), Hoehn and Yahr staging (H&Y), nonmotor symptoms scale (NMSS), PD questionnaire (PDQ-39), and SCOPA-AUT. The following psychometric attributes were explored: acceptability, scaling assumptions, reliability, precision, and construct validity. Patients' age (mean +/- standard deviation) was 63.1 +/- 11.1 years (56.7% men; duration of disease, 8.7 +/- 5.3 years; median H&Y, 2). Mean SCOPA-AUT was 23.0 +/- 11.2. SCOPA-AUT did not show floor or ceiling effect. As a whole, the SCOPA-AUT item-domain correlation was satisfactory, except for items 2 (Saliva), 7 (Faecal incontinence), 16 (Syncope), and 19 (Cold intolerance) (|r(S)| = 0.03-0.32). Internal consistency was adequate, except for thermoregulatory and cardiovascular domains (alpha coefficients, 0.56 and 0.63, respectively). Intraclass correlation coefficient for the total score was 0.71, whereas weighted kappa for individual items ranged from 0.15 to 0.71 (only items 4 and 7 were <0.40). Standard error of measurement was 6.04. The SCOPA-AUT total score correlated closely with the NMSS total score (r(S) = 0.65) and PDQ-39 Summary Index (r(S) = 0.61) and at a moderate level with H&Y staging (r(S) = 0.35) and SCOPA-MS total score (r(S) = 0.39) (all r(S) values, P < 0.0001). Correlation of SCOPA-AUT with SCOPA-COG was weak. SCOPA-AUT significantly increased as the H&Y stage increased (Kruskal-Wallis, P < 0.0001). The SCOPA-AUT Brazilian Portuguese version is an acceptable, reliable, and valid questionnaire to evaluate autonomic dysfunction in PD.

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Psychometric properties of the SCOPA‐AUT Brazilian Portuguese version

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