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Background and Purpose: Pain catastrophizing is one of the most important factors contributing to pain experience and duration of action. This study aimed to explore the moderator role of pain duration in the hypothetical relation between pain catastrophizing and pain intensity in patients with chronic musculoskeletal pain (CMSP). Methods: Seven hundred and eight patients with CMSP (mean age: 28.52 ± 7.75 years) participated in this cross-sectional and descriptive study. The pain intensity and catastrophizing of the patients was assessed with the Visual Analog Scale (VAS) and Pain Catastrophizing Scale (PCS), respectively. The time elapsed since the participants' first experience of pain (number of days) was recorded as pain duration. Results: There was a positive correlation between pain duration (r=0.181, p0.001), pain intensity (r=0.432, p0.001) and total score of pain catastrophizing. According to univariate and multivariate regression analysis, pain duration adjusting for pain catastrophizing maintained its predictor effect on pain intensity (p0.001). According to hierarchical model, the effect of pain catastrophizing on pain intensity was 44.7%, its effect increases to 48.5% adding pain duration. Conclusion: The results of this study supports that pain duration has no critical effect on the relation between pain catastrophization to pain intensity in patients with CMSP.

Purpose: The aim of this study is to evaluate the validity and reliability of the Turkish version of the Simple Physical Activity Questionnaire (SIMPAQ) in patients with common mental disorders. Methods: A total of eighty-one patients (mean age: 40.14 ± 13.05 years) were included in this study. The Turkish version of the SIMPAQ was used to evaluate the physical activity levels and sedentary behaviors of the participants. To be used as descriptive data, DSM-5 Level 1 Cross-Cutting Symptom Measure-Adult was used to evaluate mental health symptomatology. International Physical Activity Questionnaire-Short Form (UFAA-SF) and Brief Psychiatric Rating Scale (BPRS) were used to test validity of the questionnaire. Results: The items of Turkish version of the SIMPAQ exhibited excellent intercorrelation coefficient (ICC) values (time spent in bed (0.93 (95% CI: 0.90-0.96)), sedentary time 0.87 (95% CI: 0.80-0.92), walking time 0.98 (95% CI: 0.98-0.99), exercise time 0.99 (95% CI: 0.99-0.99), and incidental activity time 0.95 (95% CI: 0.92-0.97)). However, the BPRS had a significant correlation with only the sedentary time of the SIMPAQ (rho=0.25, p=0.02), indicating convergent validity was poor. Conclusion: The Turkish version of the SIMPAQ is semantically and linguistically adequate to quickly assess physical activity level and sedentary behavior in patients with common mental disorders.