For example, the piece asserts that low potassium is associated with just about every single health issue caused by smoking. Correlation is not causation
Similarly, the ordinal rankings for the score of ETS exposure in time per day were merged to produce 3 ordinal categories (0, 15, 6) representing never, low, and high average time per day of ETS exposure
Public Health 39 (1), 215235 (2018)
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Answering these questions will require integrating data from multiple sources, which in turn requires new statistical methods to translate these data into answers