出生人口性别比的男女正常比值是多少

2025-03-06 10:39:01
推荐回答(5个)
回答1:

关于正常的出生性别比,这是没有绝对标准的,在《拯救男孩》一书中就有这样的叙述:分娩时,男女比例为110:100,性别比还与温度、环境、纬度和污染有关,这也是为什么俄罗斯,北欧和东欧女多男少的原因,所谓二战的影响其实早已消失。巴西的一项科学研究则表明,环境污染会导致男孩出生数量减少。
值得注意的一项数据是2015年,这是二胎政策后的第一年,该年普查的出生性别比数据是113.51,医院分娩数据仅为108.73,这一数值已经十分接近107的出生比标准区间。2017年普查出生性别比111.90,我们基本可以断定实际出生比处于107出生比标准区间。
男孩的死亡率问题
死亡率的性别差异是一个医学议题,一般的人口学家较少会涉及这项领域,因而关于性别比的研究中大都忽视了这个问题所带来的巨大影响。中国男孩死亡率高达4‰,这种现象将造成何种影响?
举个例子,1990年第四次人口普查时,0至9岁的男性和女性人数分别为11268万人和10309万人,到了2000年第五次人口普查时均有所增加,分别为11822万和11020万。而到了2010年第六次人口普查时,男性人数下降到11484万人,而女性人数则继续不降反升,达到了11358万人,比出生时凭空多出了1050万人,男孩对比10年前却少了400万。按照这个比例,90后男孩成年时约会减少300-350万,00后则会减少200-250万,故实际性别比显然还要低得多。
在成年之前,男孩的死亡率大致可抵消2-3点性别比,成年之后到30岁还可以抵消1-2点。例如1986年出生的人群,在他们出生时性别比曾高达115,如今30年过去了,他们的性别比竟降到了97,降低了近20点。作为计划生育时代的产物,809000后三代女孩漏报点数通常在5-10点之间,而男性的死亡率则可使性别比再降3-5点,这就是为什么低年龄段性别比失衡,当这些孩子成年时性别比就会恢复正常的原因。从1953年第一次人口普查开始,当年的出生性别比是113,之后半个多世纪一直是这个规律,很大的一个原因是因为男人都过早的死了。

回答2:

出生人口性别比国际社会公认的比值是103到107之间。

回答3:

解答:出生人口性别比的男女正常比值一般在102-107,即每出生100个女婴时男婴出生数为 102个体107个,

相关知识: 出生婴儿性别比的恒定值:102-107 据资料表明,在不受干扰的情况下,世界各国出生婴儿性别比是基本一致的,人口学家把这个指标称为出生婴儿性别比的恒定值。由于男婴死亡率略高于女婴,这样到婚龄期时男女性别比例就基本持平。

回答4:

男性比女性高百分之70

回答5:

1:1.15

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