Vol. 26 (6) 2005 Neuro endocrinology letters

Academic mothers have a pronounced seasonal variation in their offspring sex ratio.

OBJECTIVES: Environmental and socio-demographic factors can influence the variation of the human sex ratio at birth (SRB = the ratio of males to males plus females). In particular, findings of seasonal, parental education, birth order, and maternal age effects on the SRB are not always in agreement, and a number of works report minimal .....