The Beck Depression Scale is a self-report questionnaire that assesses the presence and severity of depressive symptoms. It consists of 21 items. Each item is scored on a four-point scale ranging from 0 (none) to 3 (severe). Total scores can vary between 0 and 63. The reliability and validity findings of the questionnaire adapted to Turkish have been obtained.

Self-Efficacy for Managing Chronic Disease 6-Item Scale was developed by Lorig and colleagues in English in 2001 (Lorig, Sobel, Ritter, Laurent, & Hobbs, 2001). The scale is graded on a 10-point scale ranging from 'not at all confident' to 'completely confident'. The scale score is the average of 6 items. High scores indicate high self-efficacy. If more than 1 response is given to an item and the items are consecutive, the low score is included in the calculation. If 2 responses are not consecutive, this item is excluded from the calculation. In order to calculate the scale, at least 4 items must be answered. The Turkish version is a valid and reliable tool for assessing the perceived self-efficacy level of patients with chronic diseases.

Coping Strategies Long Form is the short form developed by Carver (1997) after being revised. Coping Strategies Inventory Short Form consists of 28 questions and 14 subscales. Responses to each item are evaluated in the range of 1-4 points. The raw score that can be obtained from the subscales varies between 2-8.

The Catastrophising Pain Scale (PCS) is used to measure catastrophising in response to pain through 13 statements with four possible options from 1 'never' to 4 'always'. Higher scores indicate greater catastrophised pain. The Turkish validity study of the scale was conducted by Süren et al. (2014)

PSQI is a scale developed to evaluate sleep quality and sleep disturbance in a one-month period. PSQI consists of 24 questions in total. The first 18 questions answered by the participant himself/herself are used in the calculation of the PSQI total score and component scores. The 18 items included in the scoring are grouped into 7 components. Each item is evaluated in the range of 0-3 points. The sum of the seven component scores constitutes the result of the PSQI. The lowest score is zero and the highest score is 21. A high total score indicates poor sleep quality. The sleep quality of individuals with a total score of 5 and below is considered 'good', while the sleep quality of individuals with a score above 5 is considered 'poor'. The validity and reliability study of the PSQI was conducted by Agargun et al. (1996) in our country.

The Short Form - 36 Quality of Life Questionnaire (SF-36) is a general measure of health status, rather than measuring the outcomes of specific conditions. There is evidence that the SF-36 can be used to monitor musculoskeletal conditions. The SF-36 is a health-related quality of life questionnaire consisting of 8 scales (physical functioning, role limitations due to physical health problems, pain, general health perceptions, vitality, social functioning, role limitations due to emotional problems, mental health). Responses to items are converted into scale scores from 0 (worst health) to 100 (best health). One physical and one mental summary health measure are derived from the 8 scales.