• Leire Ambrosio, Mari Carmen Portillo, Carmen Rodriguez-Blazquez, Juan Carlos Martínez-Castrillo, Mayela Rodriguez-Violante, Marcos Serrano-Dueñas, Víctor Campos-Arillo, Nelida Susana Garretto, Tomoko Arakaki, Mario Álvarez, Ivonne Pedroso-Ibáñez, Ana Carvajal, and Pablo Martinez-Martin.
• Faculty of Nursing, University of Navarre, C/ Irunlarrea, s/n, Edificio de los Castaños, 31008 Pamplona, Navarre, Spain.
• Parkinsonism Relat. Disord. 2016 Apr 1; 25: 52-7.

IntroductionTo explore the psychometric attributes of a new Satisfaction with Life Scale (SLS-6) in a wide Spanish-speaking population with Parkinson's disease (PD).MethodsThis was an international, cross-sectional study. Several rater-based and patient-reported outcomes measures for evaluation of PD (e.g., Scales for Outcomes in Parkinson's Disease-Motor) and other constructs (e.g., Duke-UNC Functional Social Support Questionnaire, Scale for Living with Chronic Illness) were applied together with the SLS-6. Acceptability, scaling assumptions, reliability, precision, and construct validity were tested.ResultsThe study included 324 patients from five countries, with age (mean ± standard deviation) 66.67 ± 10.68 years. None of the SLS-6 items had missing values and all acceptability parameters fulfilled the standard criteria. Scaling assumptions allowed the calculation of a summary index from items 2 to 6, complementary to the global evaluation (item 1). For these five items, Cronbach's alpha was 0.85; the corrected item-total correlation 0.53-0.73; inter-item correlation, 0.45-0.70, with an item homogeneity index of 0.55. The standard error of measurement, based on Cronbach's alpha for a single observation, was 3.48. SLS-6 correlations were moderate to strong (rs ≥ 0.35) with the patient-reported outcomes and weak to moderate with the rater-based assessments used in the study. The SLS-6 total score was significantly different according to PD severity levels established according to Hoehn and Yahr staging, Clinical Impression of Severity Index, and Patient-Based Global Impression of Severity scale.ConclusionThe results suggest that SLS-6 is an easy, feasible, acceptable, consistent, precise and valid measure to evaluate satisfaction with life in PD patients.Copyright © 2016 Elsevier Ltd. All rights reserved.

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