Epidemiology is the science of trying to find out what makes people healthier. Epidemiologists look at data to identify causal links between improved health and other factors. It is a correlational science which means that it can never really prove a causal link it can only suggest that a connection between two or more variables is unlikely to be caused by chance.
Correlation is a tricksy business. Perfect correlations tend not to exists so the relationships epidemiologist find are always, to a greater or lesser extend, imperfect. No matter how clear a signal we think we’ve identified,…
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