Unraveling the ties of altitude, oxygen and lung cancer
from The New York Times
Epidemiologists have long been puzzled by a strange pattern in their data: People living at higher altitudes appear less likely to get lung cancer. Associations like these can be notoriously misleading. Slice and dice the profusion of data, and there is no end to the coincidences that can arise. There is, for instance, a strong correlation between per-capita cheese consumption and the number of people strangled accidentally by their bedsheets.
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