One of the biggest issues I see people make with evidence appraisal is the idea that you have to have a yes/no answer That's not how evidence works It's ALMOST ALWAYS shades of grey
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The fact is, most studies are flawed in some way. Even the very best may not be easily usable for many reasons But a potentially biased study can still provide invaluable information
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Some examples of what biased studies have shown us: - smoking causes cancer - seatbelts save lives - asbestos causes mesothelioma - iodine deficiencies cause issues
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