The aim of the study is to adapt the Evaluation of Daily Activity Questionnaire into Turkish language, and to examine the reliability and validity for people with rheumatoid arthritis.

Patient-Reported Outcome Measures are used in clinical practice and research to identify patients with rheumatic and musculoskeletal conditions' functional problems and evaluate the effectiveness of rehabilitation for these. Most commonly, daily activities in the International Classification of Functioning, Disability and Health (ICF) domains of communication, mobility, self-care and domestic life are assessed. Measurement tools commonly used in rheumatology out-patient clinics and research (e.g., the Health Assessment Questionnaire and the Arthritis Impact Measurement Scales 2 include too few activities to be of use for treatment planning. The Evaluation of Daily Activity Questionnaire was developed in the early 1990s in Sweden to address these problems. It is a patient-reported outcome measure evaluating common symptoms and measuring, in depth, activity limitations in rheumatoid arthritis. Patients normally complete it at home, allowing them time to reflect on their abilities and activity limitations. It normally takes between 25 and 35 min to complete.

Hammond et al have developed an English Evaluation of Daily Activity Questionnaire, which has been linguistically and culturally validated for use in the UK (from the original Swedish version). This was shown to be psychometrically robust for use with patients with rheumatoid arthritis. Subsequently, Hammond et al established the EDAQ's content validity and acceptability and demonstrated reliability and validity in seven other musculoskeletal conditions: ankylosing spondylitis; osteoarthritis; systemic lupus erythematosus; systemic sclerosis; chronic pain; chronic hand/upper limb musculoskeletal disorders; and primary Sjögren's syndrome. These conditions were selected as more often referred to occupational therapy. An EDAQ User Manual is available.

This questionnaire evaluates daily living activities of patients with arthritis and musculoskeletal conditions very comprehensively. Cross-cultural adaptation of the EDAQ into the Turkish language would enable its use in Turkey to identify the daily living activity problems for patients with rheumatoid arthritis. This questionnaire will be directional in clinical and academic studies.

The aim of the study is to adapt the Evaluation of Daily Activity Questionnaire into Turkish language, and to examine the reliability and validity for people with rheumatoid arthritis.

Inclusion Criteria:

• Being 18 years of age and older
• A confirmed diagnosis of rheumatoid arthritis
• Able to read, write and understand Turkish

Exclusion Criteria:

• Have cognitive impairment affecting ability to understand and complete the study questionnaire.
• Altered their disease-modifying medication regimen in the last 3 months
• Have another neurological or psychiatric diseases that effects daily living activities

Since the Rasch analysis was used to evaluate the construct validity, it was determined that regardless of whether the scale was targeted well or not and considering the 99% confidence probability that item estimation was sufficient, a sample size of at least 210 should be taken, and 80 people should be taken for test-retest reliability.

Demographic and other socio-economic data will be collected and recorded, including age, gender, disease duration, employment status, marital status, living circumstances (alone; with significant others); number and age of children; and current medication.

Because of the Covid-19 Pandemic and health and safety reasons, the sociodemographic information form, Evaluation of Daily Activity Questionnaire, Health Assessment Questionnaire, SF-36v1 and Rheumatoid Arthritis Quality of Life Questionnaire will be adapted into a Google form questionnaire. The questionnaire will be e-mailed to the participants with rheumatoid arthritis as a Google form questionnaire weblink. For those who do not have access to e-mail and the internet, a paper questionnaire option will be available by mail.