title: Invariance of SCL-90-R dimensions of symptom distress in patients with peri partum pelvic pain (PPPP) syndrome.
abstract: OBJECTIVE
  There are no studies available that have examined the factorial invariance of dimensions underlying the Symptom Checklist-90-Revised (SCL-90-R) across at least three distinct samples. In the following study, we wished to determine whether a dimensional model comprising eight primary factors previously identified in psychiatric out-patients, phobics and the general population (Arrindell & Ettema, 2003) could be extended to a homogeneous sample of pain patients comprising females suffering from peri partum pelvic pain (PPPP) syndrome (N = 413). The internal consistency and discriminant validity of the dimensions were also examined.
  
  
  METHODS
  The SCL-90-R and measures of disability, pain-related fear, pain intensity and fatigue were administered to the participants. The multiple group method was used to determine factorial invariance. Pearson correlations were determined between the SCL-90-R and aforementioned measures.
  
  
  RESULTS
  The factorial invariance of an 8-dimensional model of primary factors underlying the SCL-90-R, namely, agoraphobia, anxiety, depression, somatization, cognitive-performance deficits, interpersonal sensitivity-mistrust, acting-out hostility and sleep difficulties, was extended with success to the present sample of PPPP patients. In spite of substantial correlations between the internally consistent SCL-90-R symptom dimensions, some evidence of discriminant validity was reported in that specific subscales showed different patterns of correlations with measures of disability, pain-related fear, pain intensity and fatigue.
  
  
  CONCLUSIONS
  The 8-dimensional system based on the work of Arrindell and Ettema (2003) was invariant across psychiatric patients, phobics, the general population and pain patients. The invariance of the SCL-90-R hostility dimensions may have implications for a re-formulation of Watson and Clark's tripartite model of general distress, specific anxiety and specific depression.
authors.affiliation: Heymans Institute, University of Groningen, The Netherlands. w_a_arrindell@hotmail.com
authors.forename: W A
authors.initials: WA
authors.lastname: Arrindell
authors.forename: Dick P H
authors.initials: DP
authors.lastname: Barelds
authors.forename: Irene C M
authors.initials: IC
authors.lastname: Janssen
authors.forename: Femke M
authors.initials: FM
authors.lastname: Buwalda
authors.forename: Jan
authors.initials: J
authors.lastname: van der Ende
mesh_terms: D000328:Adult; D000379:Agoraphobia / Q000175:diagnosis / Q000523:psychology / Q000534:rehabilitation; D001007:Anxiety / Q000175:diagnosis / Q000523:psychology; D001008:Anxiety Disorders / Q000175:diagnosis / Q000523:psychology / Q000534:rehabilitation; D001416:Back Pain / Q000175:diagnosis / Q000523:psychology / Q000534:rehabilitation; D003866:Depressive Disorder / Q000175:diagnosis / Q000523:psychology / Q000534:rehabilitation; D004185:Disability Evaluation; D005221:Fatigue / Q000175:diagnosis / Q000523:psychology / Q000534:rehabilitation; D005239:Fear; D005260:Female; D006801:Humans; D008875:Middle Aged; D018710:Pain Clinics; D010147:Pain Measurement / Q000706:statistics & numerical data; D017699:Pelvic Pain / Q000175:diagnosis / Q000523:psychology* / Q000534:rehabilitation; D010555:Personality Inventory / Q000706:statistics & numerical data*; D011594:Psychometrics; D011644:Puerperal Disorders / Q000175:diagnosis / Q000523:psychology* / Q000534:rehabilitation; D015203:Reproducibility of Results; D012803:Sick Role; D013001:Somatoform Disorders / Q000175:diagnosis / Q000523:psychology / Q000534:rehabilitation; D013223:Statistics as Topic; D013577:Syndrome