There are 39 questions in the long form Parkinson’s Disease Questionnaire, with 8 discrete scales:
- mobility (10 items)
- activities of daily living (6 items)
- emotional well-being (6 items)
- stigma (4 items)
- social support (3 items)
- cognitions (4 items)
- communication (3 items)
- bodily discomfort (3 items)
Patients are asked to think about their health and general well-being and to consider how often in the last month they have experienced certain events (e.g. difficulty walking 100 yards). Patients are asked to indicate the frequency of each event by selecting one of 5 options (likert Scale): never/occasionally/sometimes/often/always or cannot do at all.
A short form of the PDQ-39, the PDQ-8 has been developed using questions taken from the larger instrument to provide a single index score that is almost identical to those gained from the PDQ-39.
The PDQ-8 contains eight of the original 39 items of the PDQ-39; one item selected from each of the 8 scales.
The PDQ-8 provides a reliable measure of overall health status and is ideal for studies in which a shorter questionnaire is preferred.
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