Validity and Reliability of the Turkish Version of the 8-Item Parkinson’s Disease Questionnaire

Abstract

Introduction: Symptomatic control and improvement of healthrelated quality of life (HRQoL) is a key feature of the management of patients with Parkinson's disease (PD). The 39-item Parkinson's Disease Questionnaire (PDQ) and its short version, PDQ-8, validated diseasespecific patient-reported instruments, have been highly recommended to use for assessing HRQoL in patients with PD. The aim of this study was to assess the reliability and validity of the Turkish version of the PDQ-8. Methods: Eighty-three patients with PD were recruited for this methodological and cross-sectional study. The PDQ-8 was repeated to assess the test-retest reliability after one-week interval. The participants completed the 36-Item Short Form Health Survey (SF-36) as a generic HRQoL previously validated in Turkey. The Hoehn & Yahr stages of the patients were also determined. The SF-36 and Hoehn & Yahr stages were used to assess the convergent validity of the PDQ-8. Results: The Cronbach's alpha coefficient was 0.78 (95% CI: 0.70-0.84, p<0.001) for PDQ-8. The test-retest reliability was very high as the intra-class correlation coefficient was 0.97 (95% CI: 0.93-0.99, p<0.001). The PDQ-8 had significant correlations with the physical and mental component scores of SF-36 (ρ=-0.52, p<0.001 and ρ=-0.64, p<0.001, respectively) and Hoehn & Yahr stages (ρ=0.56, p<0.001). There was no evidence of floor or ceiling effects. Conclusion: The results of this study suggest that the Turkish version of the PDQ-8 is a reliable, valid, less time-consuming, and brief diseasespecific instrument to assess HRQoL in patients with Parkinson's disease.

Reliability and Validity of the Korean Short-form Eight-item Parkinson’s Disease Questionnaire (PDQ-8)

“…In this study, the independent PDQ-8 revealed acceptable internal consistency reliability (α = 0.88) and the item-total correlations (0.48-0.73) based on the acceptable points of Cronbach's α of ≥ 0.7 and the item-total correlation coefficient of ≥ 0.20 [9]. This result may be supported by the consistent previous reports [8,14,19,[21][22][23]. The Kappa coefficient demonstrated a moderate inter-rater reliability between the independent and nested PDQ-8 instruments.…”

“…[7,14,19]. Two methods were used for the linguistic validation and cross-cultural adaptation of the PDQ-8 [8,14,[20][21][22][23]. The first one is to use the 8 items derived from the existing PDQ-39 data [7,14,19].…”

“…The first one is to use the 8 items derived from the existing PDQ-39 data [7,14,19]. The other is to standard validation practice to independently administer the short-form questionnaire to respondents [8,[21][22][23].…”

“…http://www.e-jhis.org | 153 ate based on an acceptable setting points of < 20% [24], as well as findings from previous studies [8,[20][21][22][23]. The internal consistency reliability should be evaluated for measuring the strength of agreement between repeated measures [9].…”

Parkinsonlu Bireylerde Fonksiyonel Mobilite ve Aktivite Limitasyonuna Yönelik Hasta Bildirimli ve Performansa Dayalı Sonuç Ölçümleri

“…PHA-39'un kısa formu olarak geliştirilen PHA-8'in (70), Kahraman ve ark. tarafından, Türkçe versiyonunun testtekrar test güvenilirliğinin çok yüksek ve Kısa Form-36 (fiziksel komponent) ve Hoehn-Yahr Evresi ile anlamlı ilişkisinin olduğu gösterilmiştir (71). Ankette her madde 0-4 arasında puanlanmakta ve yüksek puan yaşam kalitesinin iyi olduğunu göstermektedir.…”