Limitations included coarse temporal i. Air pollution may affect perinatal health through pathways of oxidative stress and inflammation, DNA damage, and changes in endothelial function or blood flow. The rate in increased by a similar magnitude for males i.
The eAppendix discusses model specification including moving average and autoregressive terms in greater detail. Download as PDF Printable version. J Theor Biol ; 1 — METHODS:Using the Human Mortality Database, we assessed the association between the Laki event and the secondary sex ratio, infant mortality rates, and the number of births from to with time-series models that controlled for temporal trends.
Journal of Human Evolution. Orrorin Sahelanthropus Kenyanthropus. Local authority ageing statistics, net internal migration people aged 65 and over and 85 and over Figures presented show the movement of older people between local authorities and regions.
In The Descent of Man, and Selection in Relation to SexDarwin viewed many physical traits which vary around the world as being so trivial to survival  that he concluded some input from sexual selection was required to account for their presence.
We also included the Great Famine of , a known cause of unexpected birth outcomes, as a predictor in our models so that it did not inflate the estimated standard errors. The eruptions of Mount St. Extensive respiratory health effects of volcanogenic dry fog in inferred from European documentary sources.
This study may bolster the Trivers-Willard hypothesis , which suggests that poor maternal condition, such as famine, would favor giving birth to more girls. Bolin Centre for Climate Research.