In a small number of cases, it was not possible to confirm if a patient did or did not have an underlying health condition.
But for those where it was, 95% were found to have serious pre-existing issues.
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In patients over 80-years-old this figure was 96%, 60-79-years-old 95%, 40-59-years-old 88% and 20-39-years-old 82%.
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