Female population 35-39 links to GDP per capita
Comparing GDP per capita with Population ages 35-39, female, per unit of GDP across 209 countries, 2011–2025.
- Rank correlation
- -0.98
- Holding size constant
- -0.97
- Countries compared
- 209
- Period
- 2011–2025
What might link these
The strong negative correlation might suggest that countries with higher GDP per capita have fewer females in this age group relative to their GDP, possibly due to lower fertility rates or different population structures. A careful reader should consider education levels as a potential confounder. The relationship could be influenced by various socioeconomic factors.
Why this is not proof of anything
This is a correlation across countries, not an experiment. It cannot show that either indicator causes the other, and both may simply follow a third thing. This correlation could mislead by implying a direct relationship between the two indicators, when in fact it may be driven by underlying demographic or economic trends.
The second figure above repeats the measurement with national population and income held constant. It is the more conservative number: a relationship that largely disappears there was mostly telling you that larger, richer countries have more of most things.
How this was measured
Both indicators were ranked across every country reporting each, and the two rankings compared — ranks rather than raw values, because a handful of very large countries can otherwise manufacture a relationship on their own. The calculation is arithmetic over figures already published on this site; the commentary above is drafted from the two indicator names and the resulting coefficients.