§(assuming a
population of 1 million residents)
§# of DDDs per year per 1000 residents for ampicillin
§ =
750,000
DDDs per year / 1,000,000 residents * 1000
= 750 DDDs per 1000 residents per year
§This could be interpreted as an estimate of how many days of
treatment every resident, if placed on the drug, would
have consumed in a year.