Jiesi Guo and a team of colleagues across five countries published the paper behind this finding in 2022, in the Personality and Social Psychology Bulletin. Using data from the OECD’s Programme for International Student Assessment, covering 941,475 fifteen-year-olds across 78 countries in 2015 and 2018, they found that the gender gap in adolescent wellbeing, life satisfaction, positive emotion, and negative emotion all measured, was consistently larger in countries with higher scores on the Global Gender Gap Index. This is a report on published research about adolescent psychological wellbeing, not a personal diagnosis of any individual, and if a teenager in your life seems to be struggling with more than an ordinary bad patch, a GP, school counsellor, or child psychologist is a far better resource than a research summary.

What the numbers actually show

The detail that matters most, and that I think gets lost when this finding is summarized quickly, is which direction the change comes from. Girls’ wellbeing did not decline as national gender equality rose. It stayed essentially flat. Boys’ wellbeing rose, and rose by a statistically significant margin, as country-level gender equality increased. In the multilevel models, the association between equality and life satisfaction was large and significant for boys and small and not significant for girls in both the 2015 and 2018 waves. The widening gap is a story about boys gaining ground, not girls losing it, even though the practical result, a bigger gap favoring boys in the most equal countries, is the same either way.

Why it might be happening

The explanation Guo’s team leans on draws from social comparison theory, the idea that people judge their own wellbeing partly by comparing themselves to others. In societies with more rigid, distinct gender roles, the research they build on suggests people mostly compare themselves to others of the same gender. In more gender-equal societies, that comparison shifts to include the opposite gender too. Since men still tend to hold a somewhat higher average socioeconomic position even within highly equal countries, expanding the comparison group this way could work in men’s favor and against women’s, purely as a matter of what feels like a normal reference point. A related, complementary idea points to rising expectations: girls in more gender-equal countries may reasonably expect more genuine parity than they end up experiencing day to day, and that gap between expectation and lived experience, rather than any decline in objective circumstances, is what shows up as flat rather than rising wellbeing.

Does this mean equality itself is the problem

The researchers are explicit that this isn’t their conclusion, and I think it’s worth stating plainly rather than letting the paradox framing imply otherwise. Objective conditions for girls, access to education, healthcare, and legal protections, genuinely improve as countries become more gender-equal, and the authors describe that progress as valuable in its own right, independent of what it does to a subjective wellbeing score. Their point is narrower: subjective wellbeing doesn’t automatically follow objective progress, which means closing measurable gaps in rights and resources isn’t, on its own, enough to close a gap in how satisfied girls actually feel. That argues for additional, more targeted support inside schools and communities, not for slowing down equality itself.

Is this a one-off finding

It’s worth being honest about how settled this is. An earlier study, led by Margaretha de Looze and published in the Journal of Youth and Adolescence in 2018, used data from 32 European and North American countries in the 2009/10 Health Behaviour in School-aged Children survey and found the relationship between equality and life satisfaction was equally strong for boys and girls, no widening gap. Guo’s team reran their own analysis restricted to just those same HBSC-participating countries and found an effect pointing the same direction as de Looze’s, just with a smaller margin of error. When they pooled the effect sizes from both studies statistically, the combined result was significant, and the two studies didn’t differ from each other by more than chance would predict. That’s a more reassuring story than a flat contradiction, an earlier study that likely lacked the statistical power to detect a real effect, followed by a larger, more globally varied one that could, though it still leaves this as a correlational pattern rather than a proven causal one, with a modest within-country analysis of gender-equality changes between 2015 and 2018 offering the closest thing to causal evidence so far.

What I’d take from this

What stays with me isn’t the word paradox, which makes this sound stranger than the mechanism actually is. It’s that a country can genuinely open more doors for girls without anything in particular walking through them, subjectively, if nothing addresses how those girls are being asked, implicitly, to measure their own lives against a moving reference point.