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A study of adverse events in hospitals in Utah and Colorado in 15 000
people showed that those aged 65 or over had higher rates of all
adverse events (5.29% v 2.8%) and preventable adverse events (2.95% v 1.58%) than those aged under 65 (p 741).
When Thomas and Brennan adjusted for comorbid illness and case mix, however, they found that age was not an independent predictor of
preventable adverse events.