For all seven items, all response options demonstrated an increasing trend in VAS values when going from response option 2 (range: 2.8–3.0) to 3 (range: 6.1–7.2).
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Cognitive Interviewing to Develop a New Health-Related Quality of Life Measure for Parkinson's Disease: The Preference-Based Parkinson's Disease Index (PB-PDI).
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