https://cream-emu-m6b19k.mystr....ikingly.com/blog/the
WLS supplies a strong and longitudinal dataset, overcoming the constraints of prior cross-sectional studies, to check the well being in later adulthood of those who played high school football to those who didn't, after fastidiously controlling for a potential confounders. In precept, the “gold standard” approach to determine the causal relationship between playing high school football and health in later life would randomize high-school students to two groups, one assigned to play football and one assigned to not play
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