title: Association of depression and anxiety alone and in combination with chronic musculoskeletal pain in primary care patients.
abstract: OBJECTIVE
  To assess the relationship between depression and anxiety comorbidity on pain intensity, pain-related disability, and health-related quality of life (HRQL).
  
  
  METHODS
  Analysis of baseline data from the Stepped Care for Affective Disorders and Musculoskeletal Pain (SCAMP) study. All patients (n = 500) had chronic pain (>or=3-month duration) of the low back, hip, or knee. Patients with depression were oversampled for the clinical trial component of SCAMP and thus represented 50% of the study population. Patients were categorized according to pain comorbid with depression, anxiety, or both. We used analysis of variance and multivariate analysis of variance models to assess the relationships between independent and dependent variables.
  
  
  RESULTS
  Participants had a mean age of 59 years; they were 55% women, 56% White, and 40% Black. Fifty-four percent (n = 271) reported pain only, 20% (n = 98) had pain and depression, 3% (n = 15) had pain and anxiety, and 23% (n = 116) had pain, depression, and anxiety. Patients with pain and both depression and anxiety experienced the greatest pain severity (p < .0001) and pain-related disability (p < .0001). Psychiatric comorbidity was strongly associated with disability days in the past 3 months (p < .0001), with 18.1 days reported by patients with pain only, 32.2 days by those with pain and anxiety, 38.0 days by those with pain and depression, and 42.6 days in those with all three conditions. We found a similar pattern of poorer HRQL (p < .0001) in those with pain, depression, and anxiety.
  
  
  CONCLUSIONS
  The added morbidity of depression and anxiety with chronic pain is strongly associated with more severe pain, greater disability, and poorer HRQL.
authors.affiliation: VA Health Services Research and Development, Center of Excellence on Implementation of Evidenced-Based Practices, Roudebush VA Medical Center, Indianapolis, Indiana 46202, USA. mbair@iupui.edu
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Bair
authors.forename: Jingwei
authors.initials: J
authors.lastname: Wu
authors.forename: Teresa M
authors.initials: TM
authors.lastname: Damush
authors.forename: Jason M
authors.initials: JM
authors.lastname: Sutherland
authors.forename: Kurt
authors.initials: K
authors.lastname: Kroenke
mesh_terms: D000041:Absenteeism; D000328:Adult; D000368:Aged; D000928:Antidepressive Agents / Q000627:therapeutic use; D001008:Anxiety Disorders / Q000453:epidemiology* / Q000523:psychology* / Q000628:therapy; D001521:Behavior Therapy; D002908:Chronic Disease; D015331:Cohort Studies; D003131:Combined Modality Therapy; D015897:Comorbidity; D003430:Cross-Sectional Studies; D003866:Depressive Disorder / Q000453:epidemiology* / Q000523:psychology* / Q000628:therapy; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000453:epidemiology* / Q000523:psychology*; D059408:Pain Management; D010147:Pain Measurement; D011320:Primary Health Care; D011446:Prospective Studies; D011788:Quality of Life / Q000523:psychology; D012648:Self Care / Q000523:psychology; D020377:Self Efficacy; D012803:Sick Role; D012919:Social Behavior
chemical_list: D000928:Antidepressive Agents
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