• phutatorius@lemmy.zip
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    15 hours ago

    It’s kind of a trivial observation: the higher the ratio of men to women, the lower the male fertility rate is relative to the female one, since the number of babies born is, of necessity, equal. For more detail, you need to look at relative birth rates and relative mortality rates, both sliced and diced into age cohorts. The scientists also broke it down by geographic regions.

  • RBWells@lemmy.world
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    1 day ago

    Meaning now it’s slightly more likely I will have kids with 2 guys, than it is that my man will have kids with me & someone else?

    What social implications do they mean?

  • ilinamorato@lemmy.world
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    1 day ago

    Okay, I need to figure out the math on “Men have fewer children than women,” and I want to do it before I read the article.

    So we’ve got Adam, Ben, Carlos, Denise, Eve, and Freida. Adam and Eve only have two kids and only with each other. Ben has one kid with Denise. Carlos has one kid with Denise and two kids with Freida. So there are six children (twelve parentage relationships): Ben has only one kid, but Adam, Denise, Eve, and Freida all have two kids, and Carlos has three kids. In this population, men and women each have an average of two kids. No matter what I do with the math, I can’t figure out a way that a child born to a woman doesn’t count as a child born to a man as well, which would push the average for the gender up.

    I see two possible ways to reconcile this.

    First, it could be that they’re analyzing the data and saying that there are way more men who are fathers of only one child than there are mothers of only one child, and so there are statistically speaking also a few men who are fathering a lot of kids with a lot of women to balance out the math; maybe we have Gary, Harvey, Isaias, Jenny, Katrina, and Louisa; and Gary has two kids with Jenny and one kid each with Katrina, and Louisa, but Harvey has one kid with Katrina and Isaias has one kid with Louisa. Again there are six kids and twelve parentage relationships, and again there are an average of two kids per person (male or female), but Gary has four kids while Harvey and Isaias each only have one. The number of men with only one child is much greater than the number of women with only one child.

    It also could be that I’m misunderstanding the headline. I am assuming that there’s an unwritten “Men who have children at all have fewer children than women who have children at all,” but it’s not actually saying that and it might not even be what it means. Maybe we’re looking at Mike, Nirav, Oliver, Patty, and Renee; Mike has two kids with Patty and two kids with Renee, but Nirav and Oliver don’t have any kids. In this population, each man has an average of 1.33 kids while each woman has an average of 2 kids. But that just sounds like it’s saying that there are more adult men in the world than there are adult women, which I know isn’t true.

    Okay, time to read the article.

    • BassTurd@lemmy.world
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      1 day ago

      I know a guy that has 4 kids with 3 women. That would be a 3:1 ratio and that’s the type of situation that I interpreted this as. I didn’t think of it as the man had 4 kids and that was amortized across 3 women, just true or false on having children.

      • ilinamorato@lemmy.world
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        17 hours ago

        I feel like that headline would be “There are more mothers than fathers,” but in any case that statistic doesn’t work because there aren’t three women for every man in the world; you’re just cherry-picking one arbitrary and asymmetrical slice of the population. There are, for all intents and purposes, one woman for every one man; so to get the stats for your scenario, you also have to include two more statistical men, and even if they each have zero children, the average number of kids per man and the average number of kids per woman is going to be the same at 1.33.

        But what this article is saying is that there’s actually very slightly more adult men in the world than adult women, which means that the burden to bear more children per adult is falling disproportionately on women. Which is kind of like what you’re saying, though in a much, much bigger aggregate.

        So I guess what I’m saying is you’re kind of right!

    • ilinamorato@lemmy.world
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      1 day ago

      Okay, so actually it turns out that there are more adult men in the world than adult women, at least of parenting age. So, since there are still globally about 2% more women than men, that must mean that the gender disparity in life expectancy is more dramatic than I thought.

      • boonhet@sopuli.xyz
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        14 hours ago

        More men are born (but only a few percent) and we die earlier, probably because testosterone is a helluva drug. Also wars I guess.

        Difference in life expectancy is usually 5-7 years in most countries.

    • Susaga@sh.itjust.works
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      20 hours ago

      There is one way that “one man and one woman” wouldn’t be true, and that’s the trans community. Then again, I’m pretty sure the article isn’t thinking about that.

      • ilinamorato@lemmy.world
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        7 hours ago

        That’s already a small enough community, and so few members of that community become parents, that I agree it seems unlikely to be a factor in any broader research.

  • velma@lemmy.blahaj.zone
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    1 day ago

    “The key finding is that we are observing a shift from a higher total fertility rate among men to a higher total fertility rate among women, which has occurred globally in 2024. This shift is driven by an increase in the proportion of men in the population,’ explains Schubert, a researcher at the MPIDR. Schubert and his colleagues attribute this to long-term trends such as falling mortality, narrowing mortality gaps between women and men, and the link to sex-selective abortions in some countries.”

    • velma@lemmy.blahaj.zone
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      1 day ago

      Turns out when you allow sex-selective abortions and inflate the importance of men above women, there’s more men in the population and more competition for being able to procreate.

      TLDR There’s too many men around.

      • Hacksaw@lemmy.ca
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        1 day ago

        That’s so fucking made up. Every part of that sentence is made up.

        Here is actual information: "This is what the World Health Organization (WHO) considers the “expected sex ratio at birth”, which means that, in the absence of gender discrimination or interference, it’s expected that there would be around 105 boys born per 100 girls — although this can range from around 103 to 107 boys per 100 girls.”

        https://ourworldindata.org/gender-ratio

        The world ratio at birth is 105.2 which almost exactly the expected “no gender discrimination range”

        Sure some countries have SOME effect caused by gender discrimination, but gender discrimination before birth is in no way a globally significant contributor to excess males at birth.

        • velma@lemmy.blahaj.zone
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          1 day ago

          If you read the article and the study it references, selective sex abortion has affected these numbers.

          Its not the only reason, but this is also not my only comment about it here.

          • Hacksaw@lemmy.ca
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            1 day ago

            Sure, it’s a contributor, everything is a contributor. But the main thing is that young men aren’t dying like they used to in the past. That’s the primary mechanism skewing gender fertility ratios. Sex selective abortions are relevant in some countries to some extent, but globally are almost nothing. It’s a red herring.

            When you have 5 extra boys born for every 100 girls the default position is there are more reproductive aged men than women. The fact we haven’t had that has been because young boys and men disproportionately died compared to young girls and women globally. Modern medicine, laws, and general peace in most of the world has stopped that trend.

      • Jax@sh.itjust.works
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        1 day ago

        Where’s your data suggesting that sex-selective abortions have resulted in less women being born in the U.S.? Cuz the last time I checked, which was admittedly quite some time ago so I’m not sure about the numbers now, most abortions in the U.S. happen before the point where you can determine a babies gender.

  • AmidFuror@fedia.io
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    1 day ago

    Why would you use the fertility rates of men and women to measure the proportion of men and women at different ages in the population? Why wouldn’t you just measure the proportions directly?

  • Stampy@lemmy.ca
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    16 hours ago

    Maybe due to a rise in artificial insemination - women being able to become mothers without a partner and men obviously cannot do the same?