title: Oral contraceptives and premenstrual symptoms: comparison of a 21/7 and extended regimen.
abstract: OBJECTIVE
  The purpose of this study was to assess the incidence and severity of premenstrual-type symptoms in patients converted from a 21/7 oral contraceptive (OC) regimen to an extended regimen.
  
  
  METHODS
  This was a single center prospective analysis of the single item Scott and White (S&W) Mood Scale and the Penn State Daily Symptom Report (DSR17) during a 21/7-day followed by a 168-day extended regimen of an OC containing 3 mg of drosperinone and 30 microg of ethinyl estradiol (DRSP/EE).
  
  
  RESULTS
  Of the 114 patients who began the study, 111 completed the preextension 21/7 phase of the study. There were significant differences in severity in the DSR17 and the S&W mood scale among days of the cycle. (P < .0001) The highest values in both scales occurred during the 7-day hormone free interval (HFI) of the 21/7 cycles (P < .001). Of the 111 patients who completed the 21/7 phase of the study, 102 (92%) completed the 168-day extended regimen. During the extended phase of the study, subjects were divided into 2 groups: those with a 100% increase in symptoms from the first half to the second half of the last 21/7 cycle were labeled as high cyclic variability, whereas those with lesser or no cyclic change were labeled as low cyclic variability. There were 55 (54%) with increased cyclic variability in mood scores peaking during the 7-day HFI. Premenstrual-type symptoms measured by both the S&W mood scale and the DSR17 instrument decreased during the extended DRSP/EE OC regimen (P < .0001) compared with the preceding 21/7 cycle, with the greatest improvement detected in the sixth month of continuous OCs (P < .003). The patient group with greatest cyclic variability during the 21/7 regimen demonstrated the most improvement during the 168-day regimen (P < .0001). The single item S&W mood scale was significantly (P < .05) correlated to each of 17 elements of the DSR17 with Spearman R correlation coefficients of 0.25 to 0.57. The greatest correlation coefficient (Spearman's R = 0.66) is with the sum of all 17 items.
  
  
  CONCLUSIONS
  A 168-day extended regimen of DRSP/EE led to a decrease in premenstrual-type symptoms compared with the 21/7-day regimen.
authors.affiliation: Department of Obstetrics and Gynecology, Scott & White Memorial Hospital, Texas A&M University System Health Science Center College of Medicine, Temple, TX 76508, USA. acoffee@swmail.sw.org
authors.forename: Andrea L
authors.initials: AL
authors.lastname: Coffee
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Kuehl
authors.forename: Sherilyn
authors.initials: S
authors.lastname: Willis
authors.forename: Patricia J
authors.initials: PJ
authors.lastname: Sulak
mesh_terms: D000328:Adult; D000339:Affect; D000736:Androstenes / Q000008:administration & dosage* / Q000627:therapeutic use; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage* / Q000627:therapeutic use; D004334:Drug Administration Schedule; D004967:Estrogens / Q000008:administration & dosage* / Q000627:therapeutic use; D004997:Ethinyl Estradiol / Q000008:administration & dosage* / Q000627:therapeutic use; D005260:Female; D006801:Humans; D008875:Middle Aged; D000451:Mineralocorticoid Receptor Antagonists / Q000008:administration & dosage* / Q000627:therapeutic use; D011293:Premenstrual Syndrome / Q000188:drug therapy* / Q000503:physiopathology / Q000523:psychology; D011446:Prospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome
chemical_list: D000736:Androstenes; D003277:Contraceptives, Oral, Combined; D004967:Estrogens; D000451:Mineralocorticoid Receptor Antagonists; D004997:Ethinyl Estradiol; C035144:drospirenone