title: Handedness and time to pregnancy.
abstract: BACKGROUND
  Nonright-handedness, particularly mixed-handedness, has been associated with a number of medical conditions. We examined whether handedness was associated with fecundity, measured by time to pregnancy.
  
  
  METHODS
  We used data on parental handedness and time to pregnancy from 2 regional birth cohorts in Denmark: the Aalborg-Odense Birth Cohort (1984-1987) and the Aarhus Birth Cohort (1990-1992) (n = 5808 and 3426, respectively). We applied discrete-time survival analysis to assess fecundity in relation to handedness.
  
  
  RESULTS
  In both cohorts, we saw a slightly lower fecundity in individuals who reported being mixed-handed.
  
  
  CONCLUSIONS
  Our data showed a modest association between mixed-handedness and subfecundity, which suggests that these traits may share a common etiology, perhaps tracing back to the prenatal period.
authors.affiliation: Department of Epidemiology, Danish Epidemiology Science Centre, Institute of Public Health, University of Aarhus, Aarhus C, Denmark. zjl@soci.au.dk
authors.forename: Jin Liang
authors.initials: JL
authors.lastname: Zhu
authors.forename: Carsten
authors.initials: C
authors.lastname: Obel
authors.forename: Olga
authors.initials: O
authors.lastname: Basso
authors.forename: Bodil Hammer
authors.initials: BH
authors.lastname: Bech
authors.forename: Tine Brink
authors.initials: TB
authors.lastname: Henriksen
authors.forename: Jørn
authors.initials: J
authors.lastname: Olsen
mesh_terms: D015331:Cohort Studies; D003718:Denmark; D005260:Female; D005298:Fertility; D007839:Functional Laterality; D006801:Humans; D008297:Male; D011247:Pregnancy; D011795:Surveys and Questionnaires; D016019:Survival Analysis