Table 3.

Example of KPI of 1 of the 112 KPI generated

Title	Negative appendectomy rate
Description	Percentage of negative appendectomies performed
Rationale	It is an indicator of diagnostic efficiency. In order to avoid unnecessary surgery and decrease costs and complications.
Target	< 10% appendixes removed are normal
KPI collection frequency	Annually
KPI reporting frequency	Annually
KPI calculation	Numerator divided by denominator expressed as a percentage Numerator: number of patients underwent appendectomy with negative appendectomy Denominator: number of all patients underwent appendectomy
Reporting aggregation	Hospital, hospital group
Data source(s)	OR registry, medical records, patients chart, hospital discharge data, emergency surgery database