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在大多数西方公布的出生时男女性比(M/F)约为106∶100,但Guerrero和Harlap发现婴儿受孕于月经周期中期,则出生时以女性占优势,而受孕于月经周期早期或后期则男性占优势,James指出,在月经中期受孕的女婴出生率的上升是与母体当时高浓度的促性腺激素峰相平行。他这学说的部份依据是基于已经发现的,在应用hMG/hCG诱导排卵后出生的女性占优势这一现象上的。但是作者与其他学者对此概念提出疑问。为此,作者从以色列Chaim Sheba医疗中心的不孕门诊,全部应用hMG/hCG治疗而获得至少有一次足月分娩的167例妇女,共出生的256例活婴这组病例作了研究。在这256例活婴中,单胎144例,M/F为79/65男性占54.8%,双胎42例,M/F为34/50,男性占
In most Western births, the M / F ratio is about 106: 100, but Guerrero and Harlap find that infants conceive at the mid-term of the menstrual cycle are predominantly female at birth and are pregnant early or later in the menstrual cycle Then men predominate and James points out that the birth rate of girls who conceived in the middle of menstruation is in parallel with the mother’s high concentration of gonadotropin peaks. Part of his theory is based on what has been found to be a predominance of women born after ovulation induction with hMG / hCG. But the author and other scholars question this concept. To this end, the authors studied a total of 256 live births in 167 women who had at least one full-term delivery of hMG / hCG treatment from the infertility clinic at the Chaim Sheba Medical Center in Israel. Of the 256 live infants, 144 had singletons, 54.8% had M / F 79/65 males, 42 had twins with M / F of 34/50, and males