86% of those who have died from Covid-19 in Ireland had an underlying medical condition. While just a small proportion of the fatalities occurred in intensive care units - 69 of 1,403 - an analysis of admissions to ICU gives an idea of the spread of underlying conditions among people who do become critically ill with the virus.
There may be some overlap and some patients may have more than one of these conditions. Of the first 327 ICU admissions, half had chronic heart disease.
A significant number also had a chronic respiratory disease or diabetes. A body mass index (BMI) of more than 40, asthma and renal conditions also featured in some patients.