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Satisfaction with life scale (SLS-6): first validation study in Parkinson's disease population

Satisfaction with life scale (SLS-6): first validation study in Parkinson's disease population
Satisfaction with life scale (SLS-6): first validation study in Parkinson's disease population
Introduction: To explore the psychometric attributes of a new Satisfaction with Life Scale (SLS-6) in a wide Spanish-speaking population with Parkinson's disease (PD).

Methods: This 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.

Results: The 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.

Conclusion: The results suggest that SLS-6 is an easy, feasible, acceptable, consistent, precise and valid measure to evaluate satisfaction with life in PD patients.
satisfaction with life scale, sls-6, parkinson's disease, self-assessment, validation
1353-8020
1-6
Ambrosio, Leire
a968da8b-afdb-4ed5-bcf2-7742110a048d
Portillo, Mari Carmen
f913b5c5-b949-48f2-b1d0-eb7505484d5c
Rodriguez-Blazquez, Carmen
ab193914-8cd7-4c00-893f-14e14a32152c
Martínez-Castrillo, Juan Carlos
0cb5a5f7-43e3-4dfd-a422-1e40ab574204
Rodriguez-Violante, Mayela
bc3ca43e-bb7b-459a-82b4-2c9bf7a5ecb5
Serrano-Dueñas, Marcos
97098f9f-4a20-4203-915a-1dd8d561b350
Campos-Arillo, Víctor
95ad4527-aca6-4232-afcb-e5c47c0c1913
Garretto, Nelida Susana
4728f6fb-d427-42ed-ba86-9a08aeb87c62
Arakaki, Tomoko
6310f127-e6a9-42c1-ba8a-ef236f393c0f
Álvarez, Mario
8577b84e-9a18-499e-b93f-62b11c80ae02
Pedroso-Ibáñez, Ivonne
8c11b858-aa93-4a41-b2a0-bb1f4e550ef6
Carvajal, Ana
6011e3ca-3566-4c16-9bfb-cdef932147ee
Martinez-Martin, Pablo
57fb5250-c0df-4a52-855e-95f4abf55b30
Ambrosio, Leire
a968da8b-afdb-4ed5-bcf2-7742110a048d
Portillo, Mari Carmen
f913b5c5-b949-48f2-b1d0-eb7505484d5c
Rodriguez-Blazquez, Carmen
ab193914-8cd7-4c00-893f-14e14a32152c
Martínez-Castrillo, Juan Carlos
0cb5a5f7-43e3-4dfd-a422-1e40ab574204
Rodriguez-Violante, Mayela
bc3ca43e-bb7b-459a-82b4-2c9bf7a5ecb5
Serrano-Dueñas, Marcos
97098f9f-4a20-4203-915a-1dd8d561b350
Campos-Arillo, Víctor
95ad4527-aca6-4232-afcb-e5c47c0c1913
Garretto, Nelida Susana
4728f6fb-d427-42ed-ba86-9a08aeb87c62
Arakaki, Tomoko
6310f127-e6a9-42c1-ba8a-ef236f393c0f
Álvarez, Mario
8577b84e-9a18-499e-b93f-62b11c80ae02
Pedroso-Ibáñez, Ivonne
8c11b858-aa93-4a41-b2a0-bb1f4e550ef6
Carvajal, Ana
6011e3ca-3566-4c16-9bfb-cdef932147ee
Martinez-Martin, Pablo
57fb5250-c0df-4a52-855e-95f4abf55b30

Ambrosio, Leire, Portillo, Mari Carmen, Rodriguez-Blazquez, Carmen, Martínez-Castrillo, Juan Carlos, Rodriguez-Violante, Mayela, Serrano-Dueñas, Marcos, Campos-Arillo, Víctor, Garretto, Nelida Susana, Arakaki, Tomoko, Álvarez, Mario, Pedroso-Ibáñez, Ivonne, Carvajal, Ana and Martinez-Martin, Pablo (2016) Satisfaction with life scale (SLS-6): first validation study in Parkinson's disease population. Parkinsonism and Related Disorders, 1-6. (doi:10.1016/j.parkreldis.2016.02.012).

Record type: Article

Abstract

Introduction: To explore the psychometric attributes of a new Satisfaction with Life Scale (SLS-6) in a wide Spanish-speaking population with Parkinson's disease (PD).

Methods: This 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.

Results: The 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.

Conclusion: The results suggest that SLS-6 is an easy, feasible, acceptable, consistent, precise and valid measure to evaluate satisfaction with life in PD patients.

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Accepted/In Press date: 13 February 2016
e-pub ahead of print date: 15 February 2016
Keywords: satisfaction with life scale, sls-6, parkinson's disease, self-assessment, validation
Organisations: Faculty of Health Sciences

Identifiers

Local EPrints ID: 389649
URI: https://eprints.soton.ac.uk/id/eprint/389649
ISSN: 1353-8020
PURE UUID: 13baa921-bc54-42b0-a698-29f47347d68c
ORCID for Mari Carmen Portillo: ORCID iD orcid.org/0000-0003-1583-6612

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Date deposited: 11 Mar 2016 15:22
Last modified: 06 Jun 2018 12:21

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Contributors

Author: Leire Ambrosio
Author: Carmen Rodriguez-Blazquez
Author: Juan Carlos Martínez-Castrillo
Author: Mayela Rodriguez-Violante
Author: Marcos Serrano-Dueñas
Author: Víctor Campos-Arillo
Author: Nelida Susana Garretto
Author: Tomoko Arakaki
Author: Mario Álvarez
Author: Ivonne Pedroso-Ibáñez
Author: Ana Carvajal
Author: Pablo Martinez-Martin

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