Handedness and time to pregnancy.
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.
Zhu
Jin Liang
JL
Department of Epidemiology, Danish Epidemiology Science Centre, Institute of Public Health, University of Aarhus, Aarhus C, Denmark. zjl@soci.au.dk
Obel
Carsten
C
Basso
Olga
O
Bech
Bodil Hammer
BH
Henriksen
Tine Brink
TB
Olsen
Jørn
J
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