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population-level statistics
Not sure what you mean, general life choices and what we feel is 'knowledge' is based on such statistics ie don't smoke, wear your safety belt etc. These types of population studies can and should influence politics towards (in this case) a less car-oriented infrastructure for instance.
It's always nice to hear things like that, but unfortunately information about population-level statistics usually only sways people in rather indirect ways. There have been gazillions of studies about the health benefits of cycling/regular exercise but none of them have had much effect.