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Ecological survey

 

A survey based on aggregated data for some population as it exists at some point or points in time: to investigate the relationship of an exposure to a known or presumed risk factor for a specified outcome.

An example of an ecological survey is that examining low dose aspirin and haemorrhage in older people. It looked at changes in prescribing over 10 years and concluded that higher prescribing rates for low dose aspirin led to more haemorrage.