Behavioral Symptom Clusters,Inflammation, and Quality of Life in Chronic Low Back Pain

BackgroundChronic low back pain is a prevalent condition, often involving an inflammatory process. Behavioral symptoms, including depressed mood, fatigue, and sleep disturbance, intensifies pain and reduces quality of life.AimsThe objectives of this pilot study were to identify behavioral symptom clusters (depressive mood, fatigue, poor sleep) in individuals with chronic low back pain, and to determine whether there are differences in pain, quality of life and inflammation (plasma IL-6) based on cluster membership.Design and SettingsA cross-sectional study was conducted in a pain clinic.Participants/ SubjectsParticipants between ages 21 to 70 years (N=69) were enrolled if they had chronic low back pain for at least six months.MethodsParticipants completed instruments measuring, pain, depressive mood, fatigue, sleep, and demographic form. Blood (10ml) was obtained. Latent class analysis was used to identify clusters.Results and ConclusionsFindings revealed a two-class model, with Class 1 characterized by more depressive mood, fatigue, and sleep disturbance compared to Class 2. Class 1 participants reported worse quality of life than those in Class 2. Pain severity and pain interference were not significantly different between the classes. Levels of IL-6 were significantly greater in Class 1 participants compared to Class 2 with higher levels of IL-6 correlating with greater pain severity and sleep disturbances. Logistic regression revealed higher levels of IL-6 predicted Class 1 membership. Behavioral symptoms cluster exist in chronic low back pain patients and impact quality of life. Inflammation may contribute to relationship between behavioral symptoms and pain severity.     

Trajectories of Sleep Disturbance and Daytime Sleepiness in Women Before and After Surgery for Breast Cancer

ContextSleep disturbance is a problem for oncology patients.ObjectivesTo evaluate how sleep disturbance and daytime sleepiness (DS) changed from before to six months following surgery and whether certain characteristics predicted initial levels and/or the trajectories of these parameters.MethodsPatients (n = 396) were enrolled prior to surgery and completed monthly assessments for six months following surgery. The General Sleep Disturbance Scale was used to assess sleep disturbance and DS. Using hierarchical linear modeling, demographic, clinical, symptom, and psychosocial adjustment characteristics were evaluated as predictors of initial levels and trajectories of sleep disturbance and DS.ResultsAll seven General Sleep Disturbance Scale scores were above the cutoff for clinically meaningful levels of sleep disturbance. Lower performance status; higher comorbidity, attentional fatigue, and physical fatigue; and more severe hot flashes predicted higher preoperative levels of sleep disturbance. Higher levels of education predicted higher sleep disturbance scores over time. Higher levels of depressive symptoms predicted higher preoperative levels of sleep disturbance, which declined over time. Lower performance status; higher body mass index; higher fear of future diagnostic tests; not having had sentinel lymph node biopsy; having had an axillary lymph node dissection; and higher depression, physical fatigue, and attentional fatigue predicted higher DS prior to surgery. Higher levels of education, not working for pay, and not having undergone neo-adjuvant chemotherapy predicted higher DS scores over time.ConclusionSleep disturbance is a persistent problem for patients with breast cancer. The effects of interventions that can address modifiable risk factors need to be evaluated.     

Identification of distinct subgroups of breast cancer patients based on self-reported changes in sleep disturbance

Purpose

The purposes of this study were to identify distinct subgroups of patients based on self-reported sleep disturbance prior to through 6 months after breast cancer surgery and evaluate for differences in demographic, clinical, and symptom characteristics among these latent classes.

Methods

Women (n?=?398) who underwent unilateral breast cancer surgery were enrolled prior to surgery. Patients completed measures of functional status, sleep disturbance (i.e., General Sleep Disturbance Scale (GSDS); higher scores indicate higher levels of sleep disturbance), fatigue, attentional fatigue, depressive symptoms, and anxiety prior to surgery and monthly for 6 months.

Results

Three distinct classes of sleep disturbance trajectories were identified using growth mixture modeling. The high sustained class (55.0%) had high and the low sustained class (39.7%) had low GSDS scores prior to surgery that persisted for 6 months. The decreasing class (5.3%) had high GSDS score prior to surgery that decreased over time. Women in the high sustained class were significantly younger, had more comorbidity and poorer function, and were more likely to report hot flashes compared to the low sustained class. More women who underwent mastectomy or breast reconstruction were in the decreasing class. Decreasing and high sustained classes reported higher levels of physical fatigue, attentional fatigue, depressive symptoms, and anxiety compared to the low sustained class.

Conclusions

A high percentage of women has significant sleep disturbance prior to surgery that persists during subsequent treatments (i.e., radiation therapy and chemotherapy). Clinicians need to perform routine assessments and initiate appropriate interventions to improve sleep prior to and following surgery.     

A Qualitative Metasynthesis of the Experience of Fatigue Across Five Chronic Conditions

ContextFatigue is a symptom reported by patients with a variety of chronic conditions. However, it is unclear whether fatigue is similar across conditions. Better understanding its nature could provide important clues regarding the mechanisms underlying fatigue and aid in developing more effective therapeutic interventions to decrease fatigue and improve quality of life.ObjectivesTo better understand the nature of fatigue, we performed a qualitative metasynthesis exploring patients' experiences of fatigue across five chronic noninfectious conditions: heart failure, multiple sclerosis, rheumatoid arthritis, chronic kidney disease, and chronic obstructive pulmonary disease.MethodsWe identified 34 qualitative studies written in the last 10 years describing fatigue in patients with one of the aforementioned conditions using three databases (Embase, PubMed, and CINAHL). Studies with patient quotes describing fatigue were synthesized, integrated, and interpreted.ResultsAcross conditions, patients consistently described fatigue as persistent overwhelming tiredness, severe lack of energy, and physical weakness that worsened over time. Four common themes emerged: running out of batteries, a bad life, associated symptoms (e.g., sleep disturbance, impaired cognition, and depression), and feeling misunderstood by others, with a fear of not being believed or being perceived negatively.ConclusionIn adults with heart failure, multiple sclerosis, rheumatoid arthritis, chronic kidney disease, and chronic obstructive pulmonary disease, we found that fatigue was characterized by severe energy depletion, which had negative impacts on patients' lives and caused associated symptoms that exacerbated fatigue. Yet, fatigue is commonly misunderstood and inadequately acknowledged.     

How Do Fluctuations in Pain,Fatigue, Anxiety,Depressed Mood,and Perceived Cognitive Function Relate to Same-Day Social Participation in Individuals With Spinal Cord Injury?

ObjectiveThis study aimed to examine same-day associations of pain, fatigue, depressed mood, anxiety, and perceived cognitive function with social participation in the daily lives of adults with spinal cord injury (SCI).DesignObservational study used a combination of baseline surveys and 7 end-of-day (EOD) diaries.SettingGeneral community.ParticipantsIndividuals with SCI (N=168; mean age, 49.8y; 63% male, 37% female).Main Outcome MeasuresPatient-Reported Outcomes Measurement Information System short form measures (Ability to Participate in Social Roles and Activities, Pain Intensity, Depression, Anxiety, Cognitive Function Abilities) were adapted for daily administrations as EOD diaries.ResultResults of multivariable model showed that daily increases in fatigue (B=?0.10; P=.004) and depressive symptoms (B=?0.25; P=<.001) and decreases in perceived cognitive function (B=0.11; P=<.001) were significantly related to worse same-day social participation. Daily fluctuations in anxiety and pain were unrelated to same-day social participation.ConclusionsThis is the first study that shows within-person associations of common SCI symptoms with social participation in the daily lives of adults with SCI. Results from the current study may help to develop more effective individualized treatments of symptoms and symptom effect aimed at improving social participation.     

Fatigue management for adults living with HIV: A randomized controlled pilot study

Fatigue is a prevalent symptom for adults living with HIV infection. The purpose of this randomized clinical trial was to pilot test a behavioral-educational intervention to reduce fatigue. The intervention included education about daytime behaviors as well as nighttime sleep behaviors. Participants were HIV-positive, between 45 and 75 years old, unemployed, and experiencing fatigue. They were randomized to intervention (n = 25) or control (n = 26) after obtaining baseline measures, administered the intervention or attention control, and followed with monthly assessments for 3 months. Primary outcome measures included the Fatigue Severity Scale (FSS) and fatigue symptom burden using the four-dimension structure of the Memorial Symptom Assessment Scale that includes occurrence, frequency, severity, and distress of a symptom. Other measures included the International Physical Activity Questionnaire, step counts with a Fitbit Flex, Hospital Anxiety and Depression Scale, Pittsburgh Sleep Quality Index, and Sleep Behavior Rating Scale. Compared with attention controls, the intervention group had significantly (p < .05) lower FSS scores and fatigue symptom burden over time, particularly in the frequency dimension. Secondary outcomes for reducing daytime naps and improving sleep quality were also significant (p < .05). This intervention, focused on both daytime and nighttime behaviors, demonstrated promising effects for reducing fatigue among adults living with HIV. Results provide useful direction for larger clinical trials to reduce fatigue in adults living with other types of chronic illness.     

‘This constant being woken up is the worst thing’ – experiences of sleep in fibromyalgia syndrome

Purpose.?Sleep disturbance affects a high proportion of people with fibromyalgia syndrome (FMS). This study aims to explore people's perceptions of their sleep quality and the influence sleep has on their symptoms and daily lives.

Method.?Semi-structured interviews were conducted with sixteen participants diagnosed with primary FMS, covering all aspects of the sleep experience. The audio recorded qualitative interviews were transcribed verbatim and analysed using interpretative phenomenological analysis.

Results.?Poor sleep dominated participants' lives, affecting levels of pain and fatigue, engagement in daily activities and ability to cope. Participants reported experiencing blocks of sleep, with the most profound difficulty for participants being able to go back to sleep after a night time awakening. They also felt a lack of control in their ability to manage their sleep difficulties and use of day-time napping appeared to be the only perceived beneficial coping strategy for relieving daytime sleepiness and symptoms of fatigue.

Conclusions.?Greater emphasis on screening for sleep disorders and how to manage poor sleep is needed in rehabilitation programmes provided for patients with FMS.     

Distress Tolerance, Emotion Dysregulation, and Anxiety and Depressive Symptoms Among HIV+ Individuals

The current study examined the mediational effects of emotion dysregulation in terms of the relation between perceived distress tolerance and anxiety and depressive symptoms among HIV+ individuals. Participants included 176 HIV+ adults (21.6 % female, M _age = 48.40 years, SD = 8.66). Results indicated that distress tolerance was significantly related to greater depressive and anxiety symptoms. Results also indicated that emotion dysregulation mediated this association. The observed findings were evident above and beyond the variance accounted for by CD4 T-cell count, ethnicity, gender, education level, and cannabis use status. The results are discussed in terms of the potential explanatory utility of perceived distress tolerance and emotion dysregulation in terms of psychological well-being among HIV+ individuals.     

Developing a Model of Associations Between Chronic Pain,Depressive Mood,Chronic Fatigue,and Self-Efficacy in People With Spinal Cord Injury

Chronic pain, chronic fatigue, and depressive mood are prevalent conditions in people with spinal cord injury (SCI). The objective of this research was to investigate the relationship between these conditions in adults with SCI. Multivariate analysis of variance, contingency analyses, and hierarchical regression were used to determine the nature of the relationship, as well as the contribution to this relationship of self-efficacy, a potential mediator variable. Seventy participants with SCI living in the community completed an assessment regimen of demographic and psychometric measures, including validated measures of pain, fatigue, depressive mood, and self-efficacy. Results indicated that participants with high levels of chronic pain had clinically elevated depressive mood, confusion, fatigue, anxiety and anger, low vigor, and poor self-efficacy. Participants with high chronic pain had 8 times the odds of having depressive mood and 9 times the odds of having chronic fatigue. Regression analyses revealed that chronic pain contributed significantly to elevated depressive mood and that self-efficacy mediated (cushioned) the impact of chronic pain on mood. Furthermore, both chronic pain and depressive mood were shown to contribute independently to chronic fatigue. Implications of these results for managing chronic pain in adults with SCI are discussed.PerspectiveThe relationship between pain, negative mood, fatigue, and self-efficacy in adults with SCI was explored. Results support a model that proposes that chronic pain lowers mood, which is mediated (lessened) by self-efficacy, whereas pain and mood independently increase chronic fatigue. Results provide direction for treating chronic pain in SCI.     

Self-Reported Physical Symptoms in Intensive Care Unit (ICU) Survivors: Pilot Exploration Over Four Months Post-ICU Discharge

ContextSurvivors of critical illness must overcome persistent physical and psychological challenges. Few studies have longitudinally examined self-reported physical symptoms in intensive care unit (ICU) survivors.ObjectivesTo describe prevalence and severity of self-reported symptoms in 28 adult medical ICU survivors during the first four months post-ICU discharge and their associations with family caregiver responses.MethodsPatients completed the Modified Given Symptom Assessment Scale. Caregivers completed the Shortened 10-item Center for Epidemiologic Studies Depression Scale, Brief Zarit Burden Score, Pittsburgh Sleep Quality Index, and the Caregiver Health Behavior form. Data at ICU discharge (two weeks or less), and two and four months post-ICU discharge were analyzed.ResultsAcross the time points, most patients reported one or more symptoms (88.5–97%), with sleep disturbance, fatigue, weakness, and pain the most prevalent. For these four symptoms with the highest prevalence, there were: 1) moderate correlations among symptom severity at two and four months post-ICU discharge; and 2) no difference in prevalence or severity by patients' disposition (home vs. institution), except worse fatigue in patients at home at two weeks or less post-ICU discharge. Patients' overall symptom burden showed significant correlation with caregivers' depressive symptoms two weeks or less post-ICU discharge. There were trends of moderate correlations between patients' overall symptom burden and caregivers' health risk behaviors and sleep quality at two and four months post-ICU discharge.ConclusionIn our sample, sleep disturbance, fatigue, weakness, and pain were the four key symptoms during first four months post-ICU discharge. Future studies focusing on these four symptoms are necessary to promote quality in post-ICU symptom management.     

Diet,Physical Activity,and Stress Among Wheelchair Users With Multiple Sclerosis: Examining Individual and Co-Occurring Behavioral Risk Factors

ObjectiveThis study examined individual and co-occurring behavioral risk factors (diet, exercise, and stress) in wheelchair users with multiple sclerosis (MS) and potential association with MS symptoms (ie, fatigue, depression, anxiety, pain, sleep, and health-related quality of life [HRQOL]).DesignSurvey.SettingGeneral Community.ParticipantsOne hundred twenty-three wheelchair users with MS completed this study (N=123).InterventionsNot applicable.Main Outcome MeasuresParticipants were mailed instructions for accessing online questionnaires (demographic and clinical characteristics, Godin Leisure-Time Exercise Questionnaire, Perceived Stress Scale, Automated Self-Administered 24-Hour Dietary Assessment Tool, and MS symptoms).ResultsStandard cut-points were used to categorize behavioral risk factors and then identify the extent and distribution of these behaviors both individually and co-occurring. We then analyzed the associations between behavioral risk factors and MS symptoms using bivariate correlation analyses and Mann-Whitney U tests. The mean age of participants was 60.6±10.0 years, 76% identified as women, 82% had a progressive disease course, and the mean MS duration was 23.0±9.7 years. Seven participants were classified as having 0 negative health behaviors, 41 participants had 1 negative health behavior, 49 participants had 2 negative health behaviors, and 26 participants had 3 negative health behaviors. The number of negative health behaviors was significantly correlated with HRQOL (physical, r=.30; psychological, r=.47), sleep (r=.25), depressive symptoms (r=.36), and anxiety (r=.43). Mann-Whitney U tests indicated greater fatigue, depression, and anxiety as well as lower sleep quality and HRQOL among participants who reported 2 or 3 behavioral risk factors compared with 0 or 1 behavioral risk factor.ConclusionsFuture research should examine the design and implementation of multiple health behavior change interventions targeting co-occurring behavioral risk factors among wheelchair users with MS.     

Effects of nurse-led home-based exercise & cognitive behavioral therapy on reducing cancer-related fatigue in patients with ovarian cancer during and after chemotherapy: A randomized controlled trial

BackgroundHigh levels of fatigue have been documented in ovarian cancer patients. However, increased levels of fatigue are positively associated with a high risk of sleep disturbance and depression.ObjectiveTo investigate the feasibility of a nurse-led home-based exercise and cognitive behavioral therapy (E&CBT) for ovarian cancer adults with cancer-related fatigue on outcomes of fatigue, plus other secondary outcomes (sleep disturbance and depression), either during or after completion of primary cancer treatment.DesignRandomized, single-blind control trial.SettingsGynaecologic oncology department of the First Hospital of Jilin University in China.Participants72 eligible women who recently had surgery and completed their first cycle of adjuvant chemotherapy were randomly assigned to two groups.InterventionThe experimental group received exercise and cognitive behavioral therapy. Five nurses with nursing master degree were trained to deliver this intervention. Patients received online interventions each week in the patient's place of residence or in the nurse-led clinic, as requested. Home visits, coupled with telephone-based motivational interviews twice a week were available with the permission of the participants. comparison group participants received services as usual.MeasurementsThe primary outcome was measured by the Chinese version of the Piper Fatigue Scale that has 4 subscales (Behavior, Affect, Sensory, and Cognition). Secondary outcomes were measured using the Self-Rating Depression Scale and the Pittsburgh Sleep Quality Index questionnaire. Repeated-measure ANOVA was used to examine the effectiveness of this intervention in reducing fatigue, depression, and improving sleep quality.ResultsFor baseline comparisons, no significant differences were found between the two groups. After the interventions, total fatigue scores were significantly reduced from T1 to T2, to T3 in the experimental group (4.37, 4.24, 3.90), respectively. The comparison group showed almost no change in total fatigue score over time. In the repeated measures ANOVA, the differences of behavioral fatigue score (F = 11.647, p = 0.001) and cognitive fatigue score (F = 5.741, p = 0.019) were statistically significant for the group by time interaction. After the interventions, the experimental group participants demonstrated significantly lower symptoms of depression compared with the comparison group (T2: p = 0.001 and T3: p < 0.001). Sleep duration, sleep dysfunction, daytime dysfunction as well as total sleep quality significantly improved.ConclusionNurse-delivered home-based E&CBT have measurable benefits in helping women with ovarian cancer to decrease cancer-related fatigue, depressive symptoms, and improving their quality of sleep.     

Physiological and psychological correlates of sleep in HIV infection

Insomnia, a common problem associated with HIV disease, is most likely caused by a multitude of factors. This study investigated the correlations between a selected group of physiological and psychological factors and sleep quality in an HIV-infected population. A convenience sample of 79 ethnically diverse HIV-positive adults, ages 24 to 63, completed a number of questionnaires and released their laboratory records for CD4+ cell count and viral load information. Variables significantly related to sleep quality were HIV-related symptoms, total pain, fatigue, depression, state anxiety, and the number of adults in the household. Findings support the need for health care providers to consider factors that contribute to impaired sleep when developing effective care for HIV-infected individuals with sleep disturbance.     

The Utility of Melatonin for the Treatment of Sleep Disturbance After Traumatic Brain Injury: A Scoping Review

ObjectiveTo investigate the utility of melatonin supplementation as a treatment option for individuals with sleep disturbance after traumatic brain injury (TBI).Data SourcesA systematic search was conducted in 6 electronic databases (Medline, AMED, CINAHL, Embase, Scopus, and SPORTDiscus) from earliest records to April 2022.Study SelectionStudies were eligible for inclusion if they met the following criteria: a) human participants with sleep disturbance after TBI, b) melatonin or melatonergic agent used as an intervention to treat sleep disturbance, and c) outcomes of melatonin administration reported. All TBI severity types (mild, moderate, and severe) were eligible. The initial search retrieved a total of 595 articles, with 9 studies meeting the eligibility criteria.Data ExtractionTwo reviewers independently extracted data from eligible studies and assessed methodological quality. Extracted data consisted of participant and injury characteristics, melatonin interventional properties, and sleep outcome. Methodological quality was assessed via the Downs and Black checklist.Data SynthesisA total of 251 participants with TBI-induced sleep disturbance (mean age range: 14.0-42.5 years) were included. Melatonin, Circadin (prolonged-release melatonin), or Ramelteon (melatonin receptor agonist) were administered. Dosages and intervention duration ranged from 2 to 10 mg and 3 to 12 weeks, respectively. Eight out of 9 studies reported positive outcomes after melatonin treatment. Significant improvements in subjective sleep quality, objective sleep efficiency, and total sleep time were found with melatonin. Reductions in self-reported fatigue, anxiety, and depressive symptoms were also observed with melatonin treatment. No serious adverse events were reported after melatonin administration.ConclusionMelatonin has good tolerability after short-term use and the potential to be a therapeutic agent for those with sleep disturbance after TBI. Melatonin was shown to be beneficial to sleep quality, sleep duration, and sleep efficiency. Additional clinically relevant outcomes of improved mental health suggest that melatonin use may be a promising treatment option for individuals experiencing co-occurring disorders of mood and sleep disturbance post-injury.     

Mind-Body Treatments for the Pain-Fatigue-Sleep Disturbance Symptom Cluster in Persons with Cancer

ContextCo-occurring pain, fatigue, and sleep disturbance comprise a common symptom cluster in patients with cancer. Treatment approaches that target the cluster of symptoms rather than just a single symptom need to be identified and tested.ObjectivesTo synthesize evidence regarding mind-body interventions that have shown efficacy in treating two or more symptoms in the pain-fatigue-sleep disturbance cancer symptom cluster.MethodsA literature search was conducted using CINAHL, Medline, and PsychInfo databases through March 2009. Studies were categorized based on the type of mind-body intervention (relaxation, imagery/hypnosis, cognitive-behavioral therapy/coping skills training [CBT/CST], meditation, music, and virtual reality), and a preliminary review was conducted with respect to efficacy for pain, fatigue, and sleep disturbance. Mind-body interventions were selected for review if there was evidence of efficacy for at least two of the three symptoms. Forty-three studies addressing five types of mind-body interventions met criteria and are summarized in this review.ResultsImagery/hypnosis and CBT/CST interventions have produced improvement in all the three cancer-related symptoms individually: pain, fatigue, and sleep disturbance. Relaxation has resulted in improvements in pain and sleep disturbance. Meditation interventions have demonstrated beneficial effects on fatigue and sleep disturbance. Music interventions have demonstrated efficacy for pain and fatigue. No trials were found that tested the mind-body interventions specifically for the pain-fatigue-sleep disturbance symptom cluster.ConclusionEfficacy studies are needed to test the impact of relaxation, imagery/hypnosis, CBT/CST, meditation, and music interventions in persons with cancer experiencing concurrent pain, fatigue, and sleep disturbance. These mind-body interventions could help patients manage all the symptoms in the cluster with a single treatment strategy.     

Depressive and Insomnia Symptoms Sequentially Mediate the Association Between Racism-Based Discrimination in Healthcare Settings and Clinical Pain Among Adults With Sickle Cell Disease

Racism-based discrimination in healthcare settings has been associated with clinical pain in adults living with sickle cell disease; however, no studies have examined depressive and insomnia symptoms as mechanisms that may drive this relationship. This secondary data analysis examined associations between depressive and insomnia symptoms, racism-based discrimination, and clinical pain. Seventy-one adults with sickle cell disease (70% female, M_age = 38.79) provided baseline reports of racism-based discrimination, depressive symptoms, insomnia symptoms, and pain (severity, interference, catastrophizing), and they completed daily diaries of pain severity and interference over 3 months. In a sequential mediation model, baseline depressive (1st) and insomnia symptoms (2nd) significantly mediated the association between racism-based discrimination and baseline pain interference, average daily diary pain severity, and average daily diary pain interference. Although the mediation model with baseline pain severity as the outcome was significant, the total and direct effects were not. Results indicate that discrimination in healthcare settings contributes to depression, which may act on pain through sleep disturbance. Findings support the need for systemic and structural changes to eliminate discrimination in healthcare settings and behavioral mood and sleep interventions to reduce the impact of discrimination on clinical pain.PerspectiveThe relationship between discrimination in healthcare settings and pain in adults with sickle cell disease may be driven by depression and sleep disturbance, modifiable risk factors and potential treatment targets. Results suggest that systemic, structural, and institutional changes must be implemented to promote better patient care and health outcomes.     

Higher Levels of Stress Are Associated With a Significant Symptom Burden in Oncology Outpatients Receiving Chemotherapy

ContextA cancer diagnosis and associated treatments, as well as the uncertainty of the disease course, are stressful experiences for most patients. However, little information is available on the relationship between stress and symptom burden.ObjectivesThe study purpose was to evaluate for differences in the severity of fatigue, lack of energy, sleep disturbance, and cognitive function, among three groups of patients with distinct stress profiles.MethodsPatients receiving chemotherapy (n = 957) completed measures of general, cancer-specific, and cumulative life stress and symptom inventories. Latent profile analysis was used to identify subgroups of patients with distinct stress profiles.ResultsThree distinct subgroups of patients were identified (i.e., stressed [39.3%], normative [54.3%], resilient [5.7%]). For cognitive function, significant differences were found among the latent classes (stressed < normative < resilient). For both sleep disturbance and morning and evening fatigue, compared to the normative and resilient classes, the stressed class reported higher severity scores. Compared to the normative and resilient classes, the stressed class reported low levels of morning energy. Compared to the normative class, the stressed class reported lower levels of evening energy.ConclusionsConsistent with our a priori hypothesis, patients in the stressed class had the highest symptom severity scores for all four symptoms and all these scores were above the clinically meaningful cutoffs for the various instruments.