Validation of the Pain Resilience Scale in a Chronic Pain Sample

Psychosocial factors that protect against negative outcomes for individuals with chronic pain have received increased attention in recent years. Pain resilience, or the ability to maintain behavioral engagement and regulate emotions as well as cognitions despite prolonged or intense pain, is one such factor. A measure of pain-specific resilience, the Pain Resilience Scale, was previously identified as a better predictor of acute pain tolerance than general resilience. The present study sought to validate this measure in a chronic pain sample, while also furthering understanding of the role of pain resilience compared with other protective factors. Participants with chronic pain completed online questionnaires to assess factors related to positive pain outcomes, pain vulnerability, pain intensity, and quality of life. A confirmatory factor analysis confirmed the 2-factor structure of the Pain Resilience Scale previously observed among respondents without chronic pain, although one item from each subscale was dropped in the final version. For this chronic pain sample, structural equation modeling showed that pain resilience contributes unique variance to a model including pain acceptance and pain self-efficacy in predicting quality of life and pain intensity. Further, pain resilience was a better fit in this model than general resilience, strengthening the argument for assessing pain resilience over general resilience.

Gender Differences in Pain and Pain Behavior: The Role of Catastrophizing

This research examined gender differences in catastrophizing and pain in 80 healthy students (42 women, 38 men) who participated in an experimental pain procedure. Participants completed the Pain Catastrophizing Scale (PCS; Sullivan, Bishop & Pivik, 1995) prior to immersing one arm in ice water for 1 minute. Participants were later interviewed to assess the strategies they used to cope with their pain. Independent raters examined videotape records and coded participants' pain behavior during and following the ice water immersion. Results showed that women reported more intense pain and engaged in pain behavior for a longer period of time than men. When PCS scores were statistically controlled, gender was no longer a significant predictor of pain or pain behavior. For women, the helplessness subscale of the PCS contributed unique variance to the prediction of pain and pain behavior. For men, none of the PCS subscales contributed unique variance to the prediction of pain and pain behavior. Discussion addresses the social learning factors that may contribute to gender differences in pain. Discussion also addresses the limitations and clinical implications of the findings.     

Validation of the Chronic Pain Acceptance Questionnaire (CPAQ) in Cantonese-Speaking Chinese Patients

Acceptance of chronic pain has become an important concept in understanding and predicting that chronic pain sufferers can remain engaged with meaningful aspects of life. Assessment of acceptance has been facilitated by the development of Chronic Pain Acceptance Questionnaire (CPAQ). In this study, we aimed to test the reliability and validity of translated Chinese version of CPAQ to use this important tool in the future management of Hong Kong Chinese patients with chronic nonmalignant pain. Content validity was established by consensus formed among a panel of 5 experts in clinical psychology and pain specialty during the process of forward and backward translations. Test-retest reliability was examined by completing the Chinese CPAQ twice, 2 weeks apart, by 54 patients. A total of 224 Chinese patients with chronic nonmalignant pain attending our cluster multidisciplinary pain clinic were asked to complete a battery of psychometric instruments in Chinese, including an intake form for demographic data, Hospital Anxiety and Depression Score (HADS), Medical Outcome Study Short Form 36 (SF-36), Pain Catastrophizing Scale (PCS), and Pain Self-Efficacy Questionnaire (PSEQ). Analysis results showed that Chinese CPAQ had good test-retest reliability (intraclass correlation coefficient, 0.79) and internal consistency reliability (Cronbach α = 0.79). The Chinese CPAQ score was significantly correlated to anxiety, depression, pain catastrophizing, pain self-efficacy, and physical and psychosocial disability. Scree plot and Principal Components Factor analysis confirmed the same 2-factor construct as the original English CPAQ. Construct validity of the Chinese CPAQ can therefore be supported. In conclusion, the Chinese CPAQ is a reliable clinical assessment tool with valid construct for acceptance measurement in our heterogeneous Chinese patients sample with chronic nonmalignant pain.

Perspective

This article confirms the reliability and validity of a Chinese version of the CPAQ. The Chinese CPAQ can then be used by pain clinicians caring for Chinese chronic pain patients worldwide for acceptance-based psychometric assessment as well as therapies.     

Validation of a Limitations in Daily Activities Scale for Chronic Pain

Limitations in physical function and participation are important domains of assessment in chronic pain. In 1995, the International Association for the Study of Pain distributed a self-report measure of functional limitations. Although the questionnaire has been used in research studies, it has never been subjected to a thorough investigation of its measurement properties. In this study, 941 patients with chronic pain completed the 16-item Limitations in Daily Activities Scale (LIDAS) at 2 pretreatment and 1 post-treatment assessment points. Individual item analysis favored a 13-item scale. This 13-item LIDAS had a confirmed 3-factor structure consisting of limitations in personal care, global participation, and specific tasks. Reliability analyses for the total scale (α?=?.90), as well as for each factor individually (αs?=?.82–.84), indicated good internal consistency, test–retest reliability (intraclass correlations?=?.65–.88 over varying time intervals), and responsiveness to change with treatment. LIDAS scores correlated as expected with measures of pain intensity, pain cognitions, and depression, as well as with other self-report and clinician-administered measures of functional performance. Using patient global ratings as anchors, a minimal clinically important difference of 5 points was established as a criterion for meaningful individual improvement after treatment. In conclusion, the LIDAS is a reliable, valid, and clinically relevant option for assessing limitations in physical function and participation in patients with chronic pain.

Self-Regulation and Chronic Pain:The Role of Emotion

Adjustment to chronic pain is examined within the context of a model that emphasizes goal-centered self-regulatory processing. Individual differences in adjustment to chronic illness have typically been examined from within the framework of stressful person–environment transactions. However, it may be useful to examine a broader array of person–environment transactions encountered in the context of working toward personal goals. Self-regulation may be especially challenging for people with chronic pain because of the link between pain and emotion. Consistent with this perspective, we will focus on the role of emotion as an energizing force in self-regulation and discuss the implications for managing pain. We will suggest that pain and concomitant negative emotion pervasively bias information processing, constrain the selection of goals, and the ongoing process of self-regulation.     

Spouse Criticism/Hostility Toward Partners With Chronic Pain: The Role of Spouse Attributions for Patient Control Over Pain Behaviors

Spouse attributions regarding displays of pain behaviors by their partners with chronic pain may account for subsequent increases in spouse critical/hostile responses toward their partners. People with chronic low back pain (n?=?105) and their pain-free spouses (n?=?105) completed electronic diary measures 5 times per day for 14 consecutive days. Key items assessed spouse observations of patient pain behavior, attributions regarding these behaviors, and spouse critical/hostile responses toward patients. Results were 1) spouse observations of patient pain behavior at time 1 predicted high levels of spouse critical/hostile responses toward the patient at time 2. 2) “Internal” attributions (eg, the patient was attempting to influence spouse's feelings) at time 1 predicted high levels of spouse critical/hostile responses toward the patient at time 2. 3) Internal attributions mediated links between spouse-observed pain behaviors at time 1 and levels of spouse critical/hostile responses at time 2. Spouse observations of patient pain behavior was also related to an “external” attribution (ie, patient pain behavior was due to pain condition), but this attribution was not a significant mediator. A vital factor linking spouse scrutiny to spouse critical/hostile responses may be the spouse's ascribed reasons for the patient's grimacing, bracing, complaining, and so forth.Perspective: Results indicate that spouse internal and negative attributions for pain behaviors of their partners with chronic pain may influence subsequent spouse critical/hostile reactions to them. Findings suggest that replacing spouse internal and negative attributions with external, compassionate, and accepting explanations may be useful therapeutic targets for couples coping with chronic pain.     

Validation of the Chronic Pain Acceptance Questionnaire (CPAQ) in an Internet sample and development and preliminary validation of the CPAQ-8

This study investigated the psychometric properties of the Chronic Pain Acceptance Questionnaire (CPAQ) in a mixed chronic pain, Internet sample and sought to develop a valid and reliable short form. Questionnaires were completed by 428 respondents, comprising a sample accessed via the Internet (n = 319) and a sample who completed a paper and pencil version of the measures (n = 109). Using confirmatory factor analysis (CFA) the two-factor structure of the CPAQ in the Internet sample was supported, though a good model fit was only achieved following the removal of one item. The resultant 19 item CPAQ demonstrated good reliability and evidence of validity was obtained for this sample. Data from the Internet sample were used to derive an eight-item short form. The two four-item factors (activity engagement [AE] and pain willingness [PW]) were confirmed using CFA and found to be invariant across both samples with good scale reliability. Higher CPAQ-8 and subscale scores were correlated with less depression and anxiety, pain severity and pain interference, and fewer medical visits for pain. Using structural equation modelling both subscales were found to partially mediate the impact of pain severity on pain interference and emotional distress. In this model AE had stronger associations with outcomes while PW accounted for a small portion of the variance in pain interference and anxiety, but not depression. This study confirmed the two-factor structure of the CPAQ in a mixed chronic pain Internet sample and provides preliminary evidence for the psychometric soundness of the CPAQ-8.     

Differential Effect of Patient Weight on Pain-Related Judgements About Male and Female Chronic Low Back Pain Patients

Compared with men, women report more pain and are at increased risk for having pain discounted or misattributed to psychological causes. Overweight individuals experience high rates of pain and may receive suboptimal care because of provider bias. Research suggests the social consequences of being overweight are worse for women than men, and that gender and weight uniquely and interactively affect pain experience and care. Healthy participants (n?=?616) viewed 6 videos of back pain patients (1 female and 1 male of normal weight, overweight, and obese categories) performing a functional task. Participants provided judgements/ratings regarding patient pain (intensity, interference, exaggeration), potential sources of patient pain (medical, psychological), and treatment recommendations (opioids, psychological therapy, seek workplace accommodations). Results suggest that the pain of normal and overweight women and obese men was discounted (judged as less intense, less interfering, more exaggerated, and less attributable to medical factors) and judged as less in need of treatment (treated with less opioids and workplace accommodations). Across all weight categories, women's pain was attributed more to psychological factors and was more likely to receive recommendations for psychological therapy than men's pain. These findings highlight the differential effect of patient weight on pain-related judgements about women and men.

The Chronic Pain Acceptance Questionnaire: confirmatory factor analysis and identification of patient subgroups

Over the past decade, the importance of acceptance of chronic pain has been demonstrated. Acceptance has often been assessed using the 20-item, two-factor Chronic Pain Acceptance Questionnaire (CPAQ; McCracken, Vowles, Eccleston, Pain 2004;107:159-66). This two-factor model has been supported but awaits further confirmation. The present investigation sought to address this issue in two large samples of pain suffers. Exploratory factor analyses (N=333) examined a number of solutions, ranging from two to five factors. Evaluation indices provided clear support for a 20-item, two-factor solution. Confirmatory factor analyses, using the second sample (N=308), examined a number of models. Fit indices demonstrated that the model identified in the exploratory analyses had the best fit. Finally, a series of cluster analyses were performed using a combined sample (N=641). Results indicated three clusters: one with high scores on both subscales (n=146), one with low scores on both subscales (n=239), and one with discrepant scores that were high on the Activity Engagement subscale and low on the Pain Willingness subscale (n=286). Follow-up analyses indicated significant differences among the clusters across multiple measures of functioning. The cluster with low CPAQ scores reported more difficulties in comparison to the group with high scores, while the group with discrepant CPAQ scores generally reported difficulties that fell in between. These results provide further support for the 20-item, two-factor CPAQ and indicate that it is both theoretically and practically useful.     

Patient Willingness to Pay for Reductions in Chronic Low Back Pain and Chronic Neck Pain

Many recommended nonpharmacologic therapies for patients with chronic spinal pain require visits to providers such as acupuncturists and chiropractors. Little information is available to inform third-party payers’ coverage policies regarding ongoing use of these therapies. This study offers contingent valuation-based estimates of patient willingness to pay (WTP) for pain reductions from a large (n = 1,583) sample of patients using ongoing chiropractic care to manage their chronic low back and neck pain. Average WTP estimates were $45.98 (45.8) per month per 1-point reduction in current pain for chronic low back pain and $37.32 (38.0) for chronic neck pain. These estimates met a variety of validity checks including that individuals’ values define a downward-sloping demand curve for these services. Comparing these WTP estimates with patients’ actual use of chiropractic care over the next 3 months indicates that these patients are likely “buying” perceived pain reductions from what they believe their pain would have been if they didn't see their chiropractor—that is, they value maintenance of their current mild pain levels. These results provide some evidence for copay levels and their relationship to patient demand, but call into question ongoing coverage policies that require the documentation of continued improvement or of experienced clinical deterioration with treatment withdrawal.PerspectiveThis study provides estimates of reported WTP for pain reduction from a large sample of patients using chiropractic care to manage their chronic spinal pain and compares these estimates to what these patients do for care over the next 3 months, to inform coverage policies for ongoing care.     

Women and the Experience of Pain and Opioid Use Disorder: A Literature-based Commentary

It is generally understood that pain experience and opioid abuse have relied on male-dominated models. However, sex and gender play a role in both pain experience and opioid use disorder.Using the previously validated Texas Tech University Health Sciences Center Sex and Gender Specific Health PubMed Advanced Search Tool, the authors used pertinent literature to develop this literature-based commentary on sex and gender differences in pain experience and opioid use disorder. Women report their experience of pain more frequently, have increased rates of diagnoses related to pain, have increased pain sensitivity, and have a variable response to pain and analgesia. This variable response is due to anatomic, physiologic, hormonal, psychological, and social factors that differ by sex and gender. Women have been found to be at greater risk for opioid abuse in all age groups. This may be due to the differences in pain experience, as well as sex and gender differences in prescribing patterns, cultural norms, and the increased likelihood to experience dependency and withdrawal. Approaches to the treatment of opioid use disorder are also subject to sex and gender differences—an area in need of further investigation.     

Chronic Fatigue Syndrome and Chronic Widespread Pain in Adolescence: Population Birth Cohort Study

Although many studies have investigated the overlap between pain phenotypes and chronic fatigue syndrome (CFS) in adults, little is known about the relationship between these conditions in adolescents. The study's aim was therefore to identify whether a relationship exists between chronic widespread pain (CWP) and CFS in adolescents and investigate whether the two share common associations with a set of covariates. A questionnaire was administered to offspring of the Avon Longitudinal Study of Parents and Children (ALSPAC) at age 17, asking about site, duration, and pain intensity, from which participants with CWP were identified. At the same research clinic, a computer-based Revised Clinical Interview Schedule was filled out, from which a classification of CFS was obtained. The relationship between selected covariates and CFS and CWP was investigated using a variety of logistic, ordinal logistic, and multinomial regressions. We identified 3,214 adolescents with complete data for all outcomes and covariates. There were 82 (2.6%) individuals classified as CFS and 145 (4.5%) as CWP. A classification of CFS resulted in an increased likelihood of having CWP (odds ratio = 3.87; 95% confidence interval, 2.05–7.31). Female adolescents were approximately twice as likely to have CFS or CWP, with multinomial regression revealing a greater sex effect for CWP compared with CFS. Those with exclusive CFS were more likely to report higher levels of pain and greater effect of pain compared with those without CFS, although associations attenuated to the null after adjustment for covariates, which did not occur in those with exclusive CWP. Multinomial regression revealed that relative to having neither CFS nor CWP, a 1-unit increase in the depression and anxiety scales increased the risk of having exclusive CFS and, to a greater extent, the risk of having comorbid CFS and CWP, but not exclusive CWP, which was only related to anxiety.

Randomized Trial of a Low-Literacy Chronic Pain Self-Management Program: Analysis of Secondary Pain and Psychological Outcome Measures

Based on input of rural, largely Hispanic persons with chronic pain, a low-literacy, 6-month self-management program was developed, drawing on elements of existing pain toolkits. In a randomized trial, low-income, primarily Hispanic patients with chronic pain received the program in 6 sessions of 1-on-1 meetings with a trained health educator in clinic or in 8 group lectures by experts in the community. Intention-to-treat analyses in linear mixed-effects models were conducted for 5 secondary outcomes at 6 months, including Brief Pain Inventory pain severity and interference, Patient Health Questionnaire-9, 12-Item Short-Form Survey Mental Component Summary, and Tampa Scale for Kinesiophobia-11. A total of 111 participants were randomized (15.9% of 700 initially eligible from 3 clinics), and 67 (60.4%) completed 6-month measures. Among completers, the clinic arm improved on 4 measures and community arm on 3 measures (all P < .05). Effect sizes were small to moderate (.41–.52). In intention-to-treat analyses, both arms improved on 4 of 5 measures (all P ≤ .001) versus baseline, with clinically significant changes in Brief Pain Inventory pain severity and interference. Improvement in multiple outcomes after this chronic pain self-management program for low-income patients warrants further study.

Chronic Pain and Self-efficacy: The Effects of Age, Sex, and Chronicity

Abstract: Higher self-efficacy (SE) is associated with lower pain ratings in chronic pain patients, although longer experience with chronic pain leads to lower SE scores. Self-efficacy in pain patients does not appear to be clearly related to sex or age, however. This study investigated the effects of gender, age, length of pain experience (chronicity) on SE and pain ratings.
Archival data from the records of 187 patient's charts were evaluated for demographic information, chronicity, pain ratings and SE. Analyses found a significant inverse relationship between SE and pain ratings (r = −.22) and lower SE for young adult patients. Results support the conclusion that enhanced SE is an important psychosocial intervention in the treatment of chronic pain patients.