First operation

Database reports

Primary procedure election Primary operation election Patients filtering First operation Thirty days mortality Performance

Primary reports Gold standards report Basic Score report Complications report Quality of care report Outcome prognosis National report

First operation is the earliest operation. However, there are cases where more than one operations where performed on the same day. Since the database doesn't contain the time of each operation, it's impossible to determine which one was first by looking at the date.

In such case, the Basic Score is used to choose one of them. If both of them have equal maximum Basic Score, then it is impossible to determine the first operation at all.