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Reply to "CT scan risks"
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[quote=Anonymous][quote=Anonymous]How does anyone know that a cancer several years after ct scans has to do with CT scans? Sounds correlative, but not necessarily causal. There's many reasons for cancer, both environmental and genetic. [/quote] If you have a large enough sample size and account for other factors as well (family history, exposure to pesticides, etc) you can do things like a regression analysis to get a sense of it's just a correlation or it make be more causative. Also, you can look at the correlations with those other factors. These machines have been around for long enough I assume the studies have a fairly large sample size. Studies have to be pretty rigorous to make it into peer reviewed journals.[/quote]
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