The Baldness Map Has No Business Being This Precise

A decimal point can do a lot of reputational work.

A ranking circulating on X says 41.2 percent of German men are bald, compared with 32.7 percent in Sweden and 26.8 percent in Japan. The gap between Germany and Sweden is 8.5 percentage points. Put flags beside the figures and the list begins to look like a census of national follicles — perhaps even a genetic map.

It is neither.

Verdict: unsupported. The three percentages are not the results of one transparent, age-standardised scientific comparison. Germany's figure can be traced to a decades-old commercial survey. Sweden's appears in a later clinic list with no disclosed sample or method. Japan's resembles the old commercial number too. The ranking does not give us evidence that German men are 8.5 points more likely to be bald than Swedish men.

That does not mean population differences are imaginary. It means this leaderboard cannot tell us how large they are — or why they exist.

The German number is older than it looks

The supplied list closely matches a page from Vantage Hair Clinic, a Turkish hair-transplant business. That page gives Germany as 41.2 percent and Sweden as 32.76 percent and calls the figures the “latest available data.” It does not identify a field date, country sample sizes, age bands, recruitment method, diagnostic threshold or statistical uncertainty.

The same pairing appeared in a CNN Brasil article in August 2023, which attributed its ranking to World Population Review. Again: Germany 41.2, Sweden 32.7. The journey from list to article to social post preserved the decimals but not a research protocol.

Germany's number has a deeper history. Aderans, a Japanese company that sells wigs and other hair services, put Germany at 41.24 percent and Japan at 26.05 percent in its 2007 annual report. The report described a survey programme covering adult men in 21 countries and regions and then used the results to discuss the potential growth of the global hair-replacement market.

A 2022 investigation by Asahi Shimbun GLOBE+ explains how the final Aderans edition was conducted in 2009: four investigators split into two teams and visually assessed men at three locations in representative cities. The company ended the series after that edition; an Aderans spokesperson told the newspaper that the method itself was judged no longer appropriate for the times.

This was not a national clinical examination with a random sample. It was observation in selected urban places by a company with a direct commercial interest in hair loss. That does not make every observation false. It does make “41.24 percent of Germany” far more precise than the design can justify.

The Swedish 32.76 is harder to trace. It appears on the Vantage page, but Sweden was not among the countries shown in the older Aderans table that carried Germany's 41.24 and Japan's roughly 26 percent. Without a disclosed Swedish source, the viral Germany–Sweden gap is not one measurement. It is a splice.

Change the instrument, change the world

There is an unusually clean demonstration of the problem. The current World Population Review page no longer shows the viral values. It lists Germany at 41.51 percent, Sweden at 35.14 and Japan at 35.69. Japan, supposedly 26.8 percent in the post, is now slightly above Sweden.

The page cites Vantage and a Medihair online survey. Medihair says it surveyed 4,284 people across 47 countries through social media and other channels. It does not publish the number of respondents in each country, their age distribution or a clinical diagnostic process on the page. An overall sample of 4,284 divided evenly would average only about 91 people per country.

Japan did not plausibly become nine percentage points balder because an aggregator refreshed a web page. The sample and method changed. So did the result.

This is why a prevalence number needs a denominator you can inspect. Who counted as a man? How old were the participants? Did “bald” mean any receding hairline, clinically diagnosed androgenetic alopecia, or only advanced loss? Were respondents selected in a clinic, on a street, through social media or at random? Was a country represented by one city? Were the results adjusted for age?

Without those answers, the decimal is decoration.

A fairer comparison runs the other way

One study did apply the same narrow method to Germany and Sweden. In 2015, researchers examined public profile photographs from Jdate and OkCupid. They restricted the analysis to self-described Caucasian men aged 30 to 40 and counted only severe androgenetic alopecia — Norwood types VI and VII.

In that dating-profile study, the German estimate was 11.4 percent: 35 men out of 307. The Swedish estimate was 18.39 percent: 16 out of 87. Its point estimate therefore put Sweden above Germany, the reverse of the viral ranking.

That result is not a better national leaderboard. The Swedish group was tiny, the confidence intervals overlapped, the profiles and photographs could not be authenticated, and men choosing dating pictures may select images that flatter their hair. The authors studied single men with online profiles, not national populations.

Its value here is narrower. When Germany and Sweden were examined with the same age range, threshold and flawed-but-consistent method, the famous ordering disappeared. That is enough to show why the 41.2-versus-32.7 claim cannot carry the weight placed on it.

What actually causes male pattern baldness

The most common form of progressive hair loss in men is androgenetic alopecia. In susceptible scalp follicles, androgen signalling — particularly involving dihydrotestosterone, or DHT — helps shorten the growth phase and miniaturise the follicle over time. Age matters because that process accumulates.

This is not a contest to see which country has the most testosterone. A recent systematic review of circulating androgens describes a more complicated picture in which local conversion, receptor signalling and inherited follicle sensitivity matter alongside blood hormone concentrations.

The genetics are complicated too. A large genome-wide association meta-analysis of 10,846 early-onset cases and 11,672 controls identified 63 risk loci. The androgen-receptor region on the X chromosome is important, but it is not the whole inheritance story. A family-history study found that hair loss in a man's father also contributes to risk. The popular instruction to inspect only your maternal grandfather is a memorable shortcut for a polygenic trait.

Genes can help explain population patterns. They cannot rescue a bad country ranking. To attribute the Germany–Sweden gap to genetics, researchers would need comparable, representative samples and then evidence that ancestry-related genetic differences explain the observed difference after age and other factors are handled. The viral post supplies none of that.

Japan is the real scientific clue — with limits

The contrast between European and East Asian populations is better supported than the contrast between Germany and Sweden. A peer-reviewed review of androgenetic alopecia in Asian populations reports that Japanese men tend to develop it about a decade later than European men and that age-specific prevalence was about 1.4-fold lower in the studies it examined. The same review shows enormous variation among Asian studies and explicitly calls for more standardised protocols.

Genetic prediction research also warns against casually moving models between populations. A PLOS ONE study found that variants with useful predictive power in European men may not transfer to Asian men in the same way. That is evidence of a real research problem, not permission to treat a national flag as a genotype.

Japan is also an ageing, diverse modern society. A national percentage will change depending on whether it includes all adult men, age-standardises them, measures any visible thinning or counts only advanced clinical patterns. The scientific literature makes a population difference plausible. It does not validate 26.8 percent as a timeless national constant.

What the map really measures

The viral list mixes an old visual survey, later commercial web pages and decimals whose provenance varies by country. Its central Germany–Sweden comparison is unsupported. Its Japan number points in the same broad direction as some peer-reviewed research, but with a precision and comparability the source chain cannot defend.

A credible international study would publish the sampling frame, country-level sample sizes, ages, diagnostic scale, examiner agreement, uncertainty and age-standardised results. Ideally it would preregister one protocol and use it everywhere.

Until then, the honest answer to “why are German men so much balder than Swedish men?” is that we do not know that they are. The astonishing gap lives in the spreadsheet, not in evidence.

The decimals survived every repost. The method did not.