Leonard Jason's symptom questionnaire developed in 2010 for use in research studies and patient registries was the first to incorporate both frequency and severity of symptoms into an ME/CFS questionnaire.
The Symptom Questionnaire has been validated several times using a test-retest analysis, factor analysis, and as a diagnostic tool.
Download the Questionnaire using the Download Now button or find it here.
The Symptom Questionnaire has been validated several times using a test-retest analysis, factor analysis, and as a diagnostic tool.
Download the Questionnaire using the Download Now button or find it here.