title: Psychometric properties of the Parkinson's Disease Sleep Scale--Brazilian version.
abstract: Parkinson's Disease Sleep Scale (PDSS) is a specific scale for the assessment of sleep disturbances in subjects with Parkinson's Disease (PD). This cross-sectional study set out to validate the PDSS in a Brazilian Portuguese Version (PDSS-BR). Ninety-five patients with PD participated in the study; their PD symptoms were evaluated by Unified Parkinson's Disease Rating Scale (UPDRS sections I-IV) and Hoehn and Yahr scale. Patients completed Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Beck Depression Inventory (BDI) and PDSS-BR. PDSS-BR internal consistency was satisfactory (Cronbach's alpha: 0.82; all PDSS-BR items were significantly and positively associated with total score). Test-retest reliability for total PDSS-BR score was 0.94. PDSS-BR score was highly correlated with sleep PSQI scale (r(s) = -0.63; p < 0.0001) and moderately with ESS (r(s) = -0.32; p < 0.001) and UPDRS sections I (r(s) = -0.38; p < 0.0001) and II (r(s) = -0.36; p < 0.0001) and BDI (r(s) = -0.55; p < 0.0001). Depressive symptoms, as determined by the BDI, were associated with significantly worse quality of nocturnal sleep, as measured by the PDSS-BR. The psychometric attributes of the PDSS-BR were satisfactory and consistent with those of previous studies. In summary, PDSS-BR can be useful for clinical and research purposes in Brazil.
authors.affiliation: Universidade Federal do Rio Grande do Sul, Brazil.
authors.forename: Regina
authors.initials: R
authors.lastname: Margis
authors.forename: Karina
authors.initials: K
authors.lastname: Donis
authors.forename: Suzana Veiga
authors.initials: SV
authors.lastname: Schönwald
authors.forename: Simone Chaves
authors.initials: SC
authors.lastname: Fagondes
authors.forename: Thais
authors.initials: T
authors.lastname: Monte
authors.forename: Pablo
authors.initials: P
authors.lastname: Martín-Martínez
authors.forename: K Ray
authors.initials: KR
authors.lastname: Chaudhuri
authors.forename: Flávio
authors.initials: F
authors.lastname: Kapczinski
authors.forename: Carlos R M
authors.initials: CR
authors.lastname: Rieder
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil; D003863:Depression / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000150:complications; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012720:Severity of Illness Index; D012893:Sleep Wake Disorders / Q000175:diagnosis* / Q000209:etiology / Q000523:psychology*; D013223:Statistics as Topic