What is the BASDAI?

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The BASDAI, short for Bath Ankylosing Spondylitis Disease Activity Index, contains six questions regarding subjective symptoms during the week prior to answering the questions. The values range from 0-10 and are collected using VAS (please see our article on VAS for more info).

Here is the BASDAI in our questionnaire for Ankylosing Spondylitis participants filled in with example data:

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