Study and call " 9 11 " R American boy baby's birth rate drops for a time after the incident

Study and call " 9 11 " R American boy baby's birth rate drops for a time after the incident
Www.xinhuanet.com London 5 Special despatch of the 24th of moon (reporter is yellow) American researchers are in a new a period Britain>Said on the magazine, 2001 " 9 11 " R After incident happen, birth rate, boy baby of American, appear decline for a time, this confirm the intersection of calamity and social pressure that incident cause know influence, born the intersection of gender and theory of proportion.
The researchers of University of California of American say, they have investigated the whole American foetus' death data during 1996, found finally that here " 9 11 " R After the incident, the mortality of foetus of man in September of 2001 should be obviously higher than the normal level, and because mortality is raised, the quantity of boy baby born in December in the same year is lower than the normal expectancy level.
It is introduced, there is one kind in sociology research " L Own in common and lose the pain kissed " R The theory, namely after the great disaster incident happens, though the one that is influenced directly is only some people, but the whole society will feel grief, those persons influenced directly will experience the pressure. To pregnant woman, it will make them secrete corresponding hormone that the pressure increases, this kind of hormone will influence the foetus' normal development, and the male foetus is more sensitive than the women foetus to the change of this kind of hormone.
Researcher Bruckner says, this is the phenomenon existing in a lot of species, namely when facing the pressure in the colony, the birth rate of men or male offsprings will drop, this time correctly " 9 11 " R The research of incident influence has confirmed this again. Once studied to show this kind of phenomenon was formed in the long-term natural selection, favorable to the procreation under the unfavorable environment of the whole population, but does not totally know its reason of back now.
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