More than 99 percent of those who have died in Italy from COVID-19 coronavirus had pre-existing medical conditions, a new study has found.

The study was completed by the country's health officials into 355 deaths and was publicly released on Tuesday.

The results showed only three of the deceased did not have health issues before they became infected.

The three most common medical conditions were high blood pressure (75 percent), Diabetes (35 percent) and heart disease (33 percent).

Other medical conditions they had were strokes, dementia, chronic obstructive pulmonary disease, active cancer in the past five years, chronic liver disease, and chronic renal failure.

Nearly half of those in the study (48.5 percent) had three or more pre-existing conditions.