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The hypothesis was that people who used particular basic word orders would have more children. Testing this hypothesis directly, basic word order is a significant predictor of the number of children a person has (linear regression, controlling for age, sex, if the person was married, if they were employed their level of education and religion, t-value for basic word order = -18.179, p < 0.00001, model predicts 36% of the variance).
It turns out that speakers of SOV languages have more children than speakers of SVO languages, while speakers with no dominant order have the fewest children on average.
photo { Michal Pudelka }