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Several studies have demonstrated posttraumatic stress disorder (PTSD) and chronic pain comorbidity. However, there is a lack of research on the psychological variables that might explain their co-occurrence. We investigated the mediating role of distress intolerance and pain catastrophizing in this relationship. A moderated mediation model was tested. The sample comprised 114 individuals with chronic noncancer pain (90 women and 24 men; mean age, of 60.04 years [SD=9.76]). Catastrophizing had a significant effect on PTSD. Distress intolerance mediated catastrophizing and PTSD, and pain intensity moderated this relationship. New insights are provided into the psychological variables that may explain PTSD and chronic noncancer pain comorbidity. [ABSTRACT FROM AUTHOR]

Fatigue is known to interfere with function in individuals with physical disabilities. In order to monitor changes in fatigue over time and evaluate the efficacy of treatments, psychometrically sound measures of fatigue are needed. The aim of this work was to evaluate the validity of the Silhouettes Fatigue Scale with English instructions (SFS-EN) in a sample of adults with physical disabilities living in the USA. Individuals with medical conditions associated with physical disabilities responded to an online survey that included the SFS-EN as well as another validated measure of fatigue (PROMIS short form-4a Fatigue Scale), and measures of pain intensity and pain catastrophizing. 523 individuals participated (mean age = 59.1 years; SD = 11.4). Most participants were Caucasian (89%), women (59%) and unemployed (71%). Results showed strong positive correlations between both measures of fatigue, supporting the convergent validity of the SFS-EN. In addition, the magnitude of this association was significantly greater than the association between the scores of the SFS-EN and the measures of pain intensity and pain catastrophizing, supporting the former's discriminant validity. The findings extend previous results supporting the SFS as a brief, easy to administer and understand, and valid measure of fatigue. Fatigue is common in adults with physical disabilities and chronic pain. The Silhouettes Fatigue Scale (SFS) is a new single-item measure of general fatigue. Findings show that the SFS with English instructions (SFS-EN) is an easy to understand measure. Results support the convergent and discriminant validity of the SFS-EN score in adults with physical disabilities and chronic pain. [ABSTRACT FROM AUTHOR]

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Social support plays a crucial role in the quality of life of people with chronic pain. The Informal Social Support for Autonomy and Dependence in Pain Inventory assesses two functions of received social support: the promotion of autonomy and the promotion of dependence. The aim of this cross‐sectional study was to adapt this instrument for its use in the Spanish population. The sample comprised 256 individuals with chronic pain. Participants were recruited through two local associations of people with fibromyalgia, a physiotherapy unit and a hospital pain unit. The data were collected in Spain between October 2018 and January 2020. The structure of the questionnaire was analysed using confirmatory factor analysis, average variance extracted, composite reliability and internal consistency indexes, and inter‐correlations between the scales. The criterion‐related validity of the instrument was analysed by investigating its relationship with pain intensity, positive and negative affect, daily functioning, activity impairment, wellbeing and satisfaction with life. The structure with the best fit had four related factors: emotional social support for the promotion of autonomy; instrumental social support for the promotion of autonomy; emotional social support for the promotion of dependence and instrumental social support for the promotion of dependence. The scales showed adequate internal consistency. An association was found between higher levels of instrumental social support for the promotion of dependence and higher levels of pain‐related disability and decreased daily functioning. An association was also found between the promotion of autonomy and increased satisfaction with life. The Spanish version of the inventory shows appropriate psychometric properties. In the setting of disability prevention, this instrument is useful in assessing the support relationships between people with chronic pain and their relatives. [ABSTRACT FROM AUTHOR]

Background: Despite the relevance of daily function in individuals with chronic pain, few questionnaires have been designed to assess this domain in individuals with musculoskeletal pain. In addition, the Impairment and Functioning Inventory-Revised (IFI-R) is the only instrument that assesses perceived decreases in levels of daily activity after the onset of pain. Objective: To evaluate the psychometric properties of the English version of the IFI-R. Design: Cross-sectional study. Setting: A database of individuals with medical conditions commonly associated with chronic pain maintained by the University of Washington. Patients: A total of 470 individuals with chronic pain. Methods: Factorial validity was analyzed by conducting a confirmatory factor analysis via structural equation modeling. Internal consistency was evaluated by calculating Cronbach's α coefficients. Convergent validity was assessed by calculating Pearson correlation coefficients between the two scales of the IFI-R and the Patient Reported Outcome Measurement Information System (PROMIS) Pain Interference Scale. Criterion validity was analyzed by regression analysis via structural equation modeling. Main Outcome Measures: The English version of the IFI-R (IFI-R-EV) for individuals with chronic pain. Results: The IFI-R-EV consists of 30 items with two related subscales: The Daily Function subscale (α = .86). and the Impairment subscale (α = .89). A significant correlation was found between these subscales and a measure of pain interference (r's = -.33, and .35 respectively; p's < .01). We also found statistically significant associations (p < .05) between daily function and depression (β = -.14) and pain intensity (β = -.13), between impairment and depression (β = .14) and pain intensity (β = .16), and between daily function and pain acceptance (β = .14). Conclusions: The findings indicate that the IFI-R-EV provides valid and reliable measures of daily function and impairment in English-speaking individuals with a disability and chronic pain. These results are consistent with those obtained with the Spanish version. [ABSTRACT FROM AUTHOR]