Table 2.

Overview of data quality checks in the PCI registry of the Netherlands Heart Registration after uploading of the dataset

Type of control	Examples
Missing values	Variables that are coded as missing values, due to missing data
	Correct missing values: missing date of complication because there was no complication
	Missing values for left ventricular ejection fraction are only allowed if PCI indication is STEMI or non-STEMI
Domain error	Age: should be between 0 and 120 years
	Intervention number for the conducted intervention should be unique across years
	Implantation codes not uploaded according to specifications
Logical controls	A patient with out-of-hospital cardiac arrest cannot have the indication elective
	It is unlikely that a patient with a chronic total occlusion is a STEMI patient
	If a patient died, the date of target vessel revascularisation should be before the date of death

PCI percutaneous coronary intervention, STEMI ST-elevation myocardial infarction