Reliability and validity of the Turkish version of the graded chronic pain scale 2.0.

Our study was designed to investigate the reliability and validity of the Turkish version of the Graded Chronic Pain Scale 2.0. The first of the eight items that make up the scale asks about the pain days experienced in 6 months and gives information about whether the pain is persistent or not. Items: 2, 3, and 4 create the Characteristic Pain Intensity subscale and measure the pain intensity. Items: 5, 6, 7, and 8 create the Disability Score subscale and determine the patient's degree of disability. In this study, the forms were sent by e-mail. The Snowball sampling method was used in the data collection process. 80 volunteer participants who had chronic low back pain were studied. The mean age of the participants is 36.99 ± 12.03 years. Fifty (62.5%) female and thirty (37.5%) male participants were included in the study. The data collection tools used in this study were; Clinic and Demographic Evaluation Form, Oswestry Low Back Pain Disability Index, Patterns of Activity Measure Pain, Roland-Morris Disability Questionnaire, Hospital Anxiety, and Depression Scale, and Graded Chronic Pain Scale 2.0. The stages of the Beaton Protocol were followed in the translation of the scale. Validity was evaluated with the Face, Content, and Construct validity analyses. Exploratory and confirmatory factor analyses were applied to determine the construct validity of the Turkish version of the scale. Before the factor analysis, KMO and Bartlett's Tests were investigated (KMO = 0.817-good quite and Bartlett`s test p = 0.001- significant). It was observed that a 2-factor structure was formed by exploratory factor analysis. The First factor (GCPS-CPI) load 4,663, species. It constitutes 58.2% of the variance explained. The Second factor (GCPS-DS) load was 1,324. It constitutes 16.54% of the variance explained. This two factor structure was confirmed by confirmatory factor analysis. Here we got the fit index value, these are χ2 / df = 1.349, GFI = 0.941, AGFI = 0.875, CFI = 0.994, RMSEA = 0.042, IFI = 0.994, NFI = 0.948. Reliability was evaluated with the test-retest method, the parallel forms method, and the internal consistency. Cronbach's Alpha was founded as 0,894 in the reliability of the Graded Chronic Pain Scale. Ten days after completing the scale, 30 participants filled out the scale again for the Test-retest method. It was found 0.921 for ICC value GCPS total as Test-Retest reliability. One of the scales we used for the parallel forms method was RMDQ and the other was ODI. There was a statistically high correlation between ODI and GCPS (r = 0.759 p = 0.001), and between RMDQ and GCPS (r = 0.777 p = 0.001). As a result, the Turkish version of the Graded Chronic Pain Scale 2.0 is a valid and reliable measurement tool.Keywords: Graded Chronic Pain Scale, Chronic Pain, Disability, Chronic Low Back Pain, Validity, and Reliability.