. 2022 Oct 10;31(3):e20211272. doi: 10.1590/S2237-96222022000300004

Box 1. - Examples of key variables used for linkage, and possible results.

Database 1			Database 2			Result	Verdict
Patient_name^a	Date_of_ birth^a	Name_of_mother	Patient_name^a	Date_of_ birth^a	Name_of_mother	Result	Verdict
MariaAnjos	27-09-1994	LurdesSilva	MariaAnjos	27-09-1994	LurdesSilva	Matched	True positive
MariaAnjos	27-09-1994	LurdesSilva	MariaAnjos	27-09-1994	AnaCleide	Matched	False positive
MariaAnjos	27-09-1994	LurdesSilva	MariaAnjos	13-03-2001	MariaDores	Non-matched	True positive
MariaAnjos	27-09-1994	LurdesSilva	MariaAnjos	27-09-1894	LurdesSilva	Non-matched	False positive

a) Field used as linkage key.