Just to add to your comment: Excess mortality is the number of deaths, or mortality, caused by a specific disease, condition, or exposure to harmful circumstanc

Just to add to your comment: Excess mortality is the number of deaths, or mortality, caused by a specific disease, condition, or exposure to harmful circumstances such as radiation, environmental chemicals, or natural disaster. It's a measure of the deaths which occurred over and above the regular death rate that would be predicted (in the absence of that negative defined circumstance) for a given population. Had the doctor not murdered any patients, he would have had the expected number of patient deaths, but the Cambridge statistician found that the number of patients that died under his care almost perfectly matched the expected number plus the number he murdered, meaning he was a statistically average doctor when he wasn’t murdering his patients.