One theory is the likelihood of prenatal care finding and solving problems prior to birth. In the US lower income people without insurance or crappy insurance cannot afford to get the same level of care so it results in higher infant mortality rates. It is also one of the theories on overall outcomes in general (any age), things get caught earlier for a good section of the population here.On a related note ... why is infant mortality in Canada significantly lower than in the USA?
(there are quite a few countries with a lower rate than Canada has ... most of Europe + Japan + Australia + NZ + South Korea)
A study I read years back was interesting in the catching early context, Canada has a lower rate of cancer deaths than the US. We also have a lower rate of late stage cancer. The thesis is, it gets caught sooner here for a big chunk of the population so it is dealt with earlier on average. BUT the US had, at least at that time, better outcomes for late stage cancer....
Income disparity also results in poorer eating habits, nutrition, etc. so that will also play a big factor for the lowest income groups.
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