title: Lifetime socioeconomic position in relation to onset of perimenopause.
abstract: OBJECTIVE
  To assess the association between lifetime socioeconomic position and onset of perimenopause.
  
  
  METHODS
  Prospective cohort study.
  
  
  METHODS
  Boston, Massachusetts.
  
  
  METHODS
  603 premenopausal women aged 36-45 years at baseline who completed a cross sectional survey on childhood and adult socioeconomic position.
  
  
  METHODS
  Time to perimenopause, defined as time in months from baseline interview to a woman's report of (1) an absolute change of at least seven days in menstrual cycle length from baseline or subjective report of menstrual irregularity; (2) a change in menstrual flow amount or duration; or (3) cessation of periods for at least three months, whichever came first.
  
  
  RESULTS
  Incidence of perimenopause was 1.75 times higher (95%CI 1.10 to 2.79) and median age at onset was 1.2 years younger (44.7 v 45.9 years) for women reporting childhood and adult economic distress compared with women reporting no lifetime economic distress. After adjustment for age, race/ethnicity, age at menarche, parity, oral contraceptive use, family history of early menopause, depression, smoking, and body mass index, the association weakened (incidence rate ratio (IRR)=1.59; 95%CI 0.97 to 2.61). Inverse associations were observed for most, but not all, measures of educational level. Measures of current household income were not associated with risk of perimenopause.
  
  
  CONCLUSIONS
  This study suggests that adverse socioeconomic conditions across the lifespan, when measured in terms of economic hardship and low educational attainment, may be associated with an increased rate of entry into perimenopause.
authors.affiliation: Obstetrics and Gynecology Epidemiology Center, Brigham and Women's Hospital/Harvard Medical School, Boston, USA. lwise@hsph.harvard.edu
authors.forename: L A
authors.initials: LA
authors.lastname: Wise
authors.forename: N
authors.initials: N
authors.lastname: Krieger
authors.forename: S
authors.initials: S
authors.lastname: Zierler
authors.forename: B L
authors.initials: BL
authors.lastname: Harlow
mesh_terms: D000328:Adult; D000367:Age Factors; D015992:Body Mass Index; D002979:Climacteric; D003430:Cross-Sectional Studies; D004522:Educational Status; D005260:Female; D006801:Humans; D008875:Middle Aged; D011203:Poverty; D011446:Prospective Studies; D017584:Reproductive History; D012307:Risk Factors; D012959:Socioeconomic Factors