Interesting results. I can easily imagine, that raising boys and girls may be variously difficult (at least at certain ages and perhaps for the mother or the father) but I had not thought that the mother's lifespan may be affected by the sex of her child. I hope, that fact doesn't result in higher abortion rates after knowing the sex of the child! :-)

P.S.: I think that there are little mistakes in the citation formatting of sources 6 and 7 in the text above.