Pain, Perceived Injustice, and Pain Catastrophizing in Chronic Pain Patients in Ireland.

Chronic pain is a public health concern affecting 20% to 30% of the population of Western countries. Psychological risk factors can worsen chronic pain patients. Themes of perceived injustice (PI) and pain catastrophizing are related to poor clinical outcomes. Particularly, perceived injustice has not been assessed systematically in patients at their first presentation in chronic pain clinics in Ireland. This study aims to assess the Injustice Experience Questionnaire (IEQ)'s internal consistency in the Irish population, assess PI in patients attending a chronic pain clinic in Ireland using the IEQ, investigate pain catastrophizing through the Pain Catastrophizing Scale (PCS) and its relationship with IEQ scores, and explore their relationships with self-reported Numeric Pain Rating Scale. One hundred adult patients were randomly selected from those attending the clinic for the first time. Eighty completed the IEQ (mean age 49 years, ranged 22 to 90 years; 59% female). The internal consistency of the IEQ was excellent (Cronbach's alpha = 0.93). Twenty-six patients (33%) had IEQ scores classified as severe. Patients whose cause of pain was trauma or road traffic accidents were more likely to have clinically severe scores than all other causes of pain (47% vs. 23%, P = 0.03). This has clinical consequences and may have legal implications. Pain catastrophizing scores were strongly correlated with IEQ (r = 0.60, P < 0.001). The correlation between IEQ and the Numeric Pain Rating Scale was weak (r = 0.25, P = 0.048). The results suggest that the IEQ may provide an additional tool to assess psychological contributors in problematic chronic pain patients and to institute targeted therapies to improve clinical outcomes.

Margiotta F ，Hannigan A ，Imran A ，Harmon DC ... -  《-》

Cross-cultural adaptation and validation of Injustice Experience Questionnaire in Greek.

Bilika P ，Vidakis G ，Loukadakis M ，Lignou E ，Kapreli E ... -  《-》

Perceived injustice in fibromyalgia: psychometric characteristics of the Injustice Experience Questionnaire and relationship with pain catastrophising and pain acceptance.

To validate a Spanish version of the Injustice Experience Questionnaire (IEQ), a measure of perceived injustice, in a fibromyalgia sample and to examine its relationship with pain catastrophising and pain acceptance. The IEQ was administered along with the Pain Visual Analogue Scale, the Fibromyalgia Impact Questionnaire, the Hospital Anxiety and Depression Scale, the Pain Catastrophizing Scale (PCS) and the Chronic Pain Acceptance Questionnaire (CPAQ) to 250 primary care patients with fibromyalgia. The IEQ had good test-retest reliability (intraclass correlation coefficient=0.98) and internal consistency (Cronbach's α=0.92). The factor structure obtained was similar to the original validation study. The multiple regression analyses showed that perceived injustice (PI) accounted for significant pain-related outcomes after controlling pain intensity, PCS and CPAQ. Principal component analysis of both the IEQ and the CPAQ taken together showed that the two constructs do not represent opposite extremes of the same dimension. The IEQ is a reliable assessment tool for measuring PI among patients with fibromyalgia. PI seems to be distinct from catastrophising, although the two constructs are very similar. The factor analysis showed that PI and acceptance represent related constructs, and this entails relevant implications for therapy, as acceptance-based interventions would be appropriate.

Rodero B ，Luciano JV ，Montero-Marín J ，Casanueva B ，Palacin JC ，Gili M ，López del Hoyo Y ，Serrano-Blanco A ，Garcia-Campayo J ... -  《-》

Injustice Experience Questionnaire, Japanese Version: Cross-Cultural Factor-Structure Comparison and Demographics Associated with Perceived Injustice.

Yamada K ，Adachi T ，Mibu A ，Nishigami T ，Motoyama Y ，Uematsu H ，Matsuda Y ，Sato H ，Hayashi K ，Cui R ，Takao Y ，Shibata M ，Iso H ... -  《PLoS One》

Psychometric assessment of the Swedish version of the injustice experience questionnaire among patients with chronic pain.

The use of the Injustice Experience Questionnaire (IEQ) in psychological assessment of individuals with chronic pain is supported by research. The psychometric properties of the Swedish version, the IEQ-S, has not yet been evaluated. Hence, the aim was to investigate structural validity, and concurrent criterion validity of the IEQ-S against the Work Ability Index (WAI), the Pain Catastrophizing Scale (PCS-SW), the Patient Health Questionnaire 9-item depression module (PHQ-9), and the Generalized anxiety disorder 7-item scale (GAD-7). Internal consistency and test-retest reliability were also studied. Sixty-five participants, referred to a University hospital, with a pain duration over three months were consecutively sampled. They completed the IEQ-S at admission and again within six weeks. A confirmatory factor analysis was performed for the study of structural validity. Concurrent criterion validity was evaluated using Spearman's correlation coefficient. Internal consistency reliability for the full IEQ-S was calculated using the Cronbach's alpha. Test-retest reliability was calculated using an Intraclass Correlation Coefficient (ICC). The median total score (0-48, where high scores indicate high levels of injustice) at admission (test 1) was 27.0 (n=64), 25th percentile=15.3, 75th percentile=37.8, range=3-48 points. A one-factor model was supported with item-loadings between 0.67-0.92. Spearman's correlation coefficient between the IEQ-S and the WAI (n=56) was rS =-0.46; the PCS-SW (n=63) was rS =0.68, the PHQ-9 (n=64) was rS =0.50 and the GAD-7 (n=64) was rS =0.57, p<0.01. Cronbach's alpha was 0.94 (n=64). The ICC was 0.80 (n=55), with a 95% confidence interval, ranging between 0.69-0.88. Our study supported structural validity and concurrent criterion validity of the IEQ-S against other measures of psychological constructs and work ability. It also supported the internal consistency reliability of the IEQ-S and the test-retest reliability with a retest interval up to six weeks, was good. These findings support the use of the IEQ-S as an adjunct tool to assess appraisals of injustice in patients with chronic pain who are referred to tertiary care in Sweden. The added value might be identification of those who are at risk for slow or no improvement in their pain condition over time, and sick-leave, but this has to be confirmed in future studies. EPN Uppsala D-No 2016-376.

Ahlqvist Lindqvist E ，Ljungvall H ，Zetterberg L ，Zetterberg H ，Bring A ，de Belder Tesséus C ，Åsenlöf P ... -  《-》