Parkinson's Disease Questionnaire (PDQ-8)
Top Contributors - Arnold Fredrick D'Souza, Rucha Gadgil, Kim Jackson, Lucinda hampton, Aminat Abolade and Kapil Narale
Introduction[edit | edit source]
The eight-item Parkinson’s Disease Questionnaire (PDQ-8) is a brief version of thirty nine-item Parkinson’s Disease Questionnaire (PDQ-39) formulated to reduce the respondent burden and convenient use among persons with Parkinson's Disease in clinical settings.[1] PDQ-39 consists of 39 questions from 8 dimensions which include mobility, activities of daily of living, emotional well-being, stigma, social support, cognition, communication, and bodily discomfort.[2]. PDQ-8 was constructed by taking one question from each domain of PDQ-39.[1]
Intended Population[edit | edit source]
It is a patient-reported outcome measure used to quantify the quality of life among persons with Parkinson's disease.[1]
Method of Use[edit | edit source]
Equipment Required[edit | edit source]
Questionnaire could be administered via pen and paper or telephonically.
Training Required[edit | edit source]
There is no training required prior to administering the PDQ-8.
Time Required[edit | edit source]
It takes approximately 5-10 minutes to administer.
This instrument is copyrighted and its use requires applying for a licence from Oxford University Innovation.
Instrument and Scoring[edit | edit source]
It is an eight-question instrument with questions taken from each domain of PDQ-39: mobility, activities of daily of living, emotional well-being, stigma, social support, cognition, communication, and bodily discomfort.
The questions are:
Due to having Parkinson’s disease, how often during the last month have you…
- Had difficulty getting around in public?
- Had difficulty dressing yourself?
- Felt depressed?
- Had problems with your close personal relationships?
- Had problems with your concentration, e.g. when reading or watching TV?
- Felt unable to communicate with people properly?
- Had painful muscle cramps or spasms?
- Felt embarrassed in public due to having Parkinson’s disease?
Each question is scored between 0 and 4 as follows:
- Never = 0
- Occasionally = 1
- Sometimes = 2
- Often = 3
- Always or cannot do at all = 4
Finally, the total score is calculated after adding the individual scores. A higher score signifies poorer quality of life.
(Click here to download a sample copy of PDQ-8)
It has been translated to multiple languages. The translated versions can be found here.
Psychometrics[edit | edit source]
Inter-rater/ Intra-rater reliability[edit | edit source]
There is strong correlation between the summary indices of the PDQ-8 and the PDQ-39 (r=0.93, P<0.001).[3]
Internal Consistency[edit | edit source]
The PDQ-8 has acceptable internal consistency (Cronbach’s α = 0.80; item-scale correlation efficient: 0.56–0.72).[3]
Validity[edit | edit source]
The PDQ-8 has excellent convergent and concurrent validity.[4]
Additional Resources[edit | edit source]
For queries related to licence application, click here to contact the licence holder - Oxford University Innovation.
References[edit | edit source]
- ↑ 1.0 1.1 1.2 Peto V, Jenkinson C, Fitzpatrick R. PDQ-39: a review of the development, validation and application of a Parkinson's disease quality of life questionnaire and its associated measures. J Neurol. 1998 May;245 Suppl 1:S10-4.
- ↑ Hagell P, Whalley D, McKenna SP, Lindvall O. Health status measurement in Parkinson's disease: validity of the PDQ-39 and Nottingham Health Profile. Mov Disord. 2003 Jul;18(7):773-83.
- ↑ 3.0 3.1 Chen K, Yang YJ, Liu FT, Li DK, Bu LL, Yang K, et al. Evaluation of PDQ-8 and its relationship with PDQ-39 in China: a three-year longitudinal study. Health Qual Life Outcomes. 2017 Aug 24;15(1):170.
- ↑ Huang TT, Hsu HY, Wang BH, Chen KH. Quality of life in Parkinson's disease patients: validation of the Short-Form Eight-item Parkinson's Disease Questionnaire (PDQ-8) in Taiwan. Qual Life Res. 2011 May;20(4):499-505.
