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Jo Nijs
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===The Chronic fatigue syndrome activities and participation questionnaire (CFS-APQ) === In his PhD, Nijs took on the task of devising a new activities questionnaire for ME/CFS. Many of the surveys that were used at the time such as the Short Form 36-Item Health Survey [[Short Form 36-Item Health Survey|(SF-36]]), Karnofsky scores and the Symptom Checklist (SCL-90) were not specific to this illness, so they might overlook important aspects of ME/CFS-disability. By analyzing various questionnaires retrospectively,<ref name="Activity Limitations, 2002" /> Nijs came up with 26 new questions that map out the particular limitations ME/CFS-patients face (e.g. making the bed, preparing meals, reading etc.). The questionnaire, called the 'Chronic Fatigue Syndrome Activities and Participation Questionnaire' (CFS-APQ), showed good construct validity and internal consistency<ref name="NijsCV2004" /> but was unable to differentiate between ME/CFS and fibromyalgia patients.<ref name="Nijs, 2003" />
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