title: Measurement properties of the calendar of premenstrual experience in patients with premenstrual syndrome.
abstract: OBJECTIVE
  To assess the reliability and factor structure of the Calendar of Premenstrual Experiences (COPE) in premenstrual syndrome (PMS) patients.
  
  
  METHODS
  Healthy women diagnosed with PMS (N = 215) completed daily diaries assessing 22 PMS behavioral and physical symptoms over two consecutive months.
  
  
  RESULTS
  Internal consistency (alpha) was high (.93-.94) for the COPE total score and behavioral subscale score and moderately high (.79) for the physical subscale score. Test-retest correlations produced lower estimates of reliability (.55-.59). Four factors, accounting for 64% of the total variance, were extracted: mood symptoms, somatic/cognitive symptoms, appetitive symptoms and fluid retention symptoms. Symptom reports increased in consecutive luteal phases for three of the four factors; however, the factor structure remained consistent in consecutive months.
  
  
  CONCLUSIONS
  The COPE diary is a reliable instrument for identifying fluctuations in behavioral and physical symptoms during the luteal phase, and PMS symptoms can be reliably conceptualized within four factors. Symptom expression may increase in response to daily self-monitoring.
authors.affiliation: Department of Medical and Clinical Psychology, Uniformed Services, University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814-4799, USA. mfeuerstein@usuhs.mil
authors.forename: Michael
authors.initials: M
authors.lastname: Feuerstein
authors.forename: William S
authors.initials: WS
authors.lastname: Shaw
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008016:Life Change Events; D008499:Medical Records; D008597:Menstrual Cycle / Q000502:physiology* / Q000523:psychology*; D011293:Premenstrual Syndrome / Q000150:complications* / Q000503:physiopathology / Q000523:psychology*; D015203:Reproducibility of Results; D013997:Time Factors