Table 2.

Outcomes for matched cohorts

	Identifiable linkage (n=166)	Non-identifiable linkage (n=169)
Total patient days followed	99 241	89 736
Follow-up per patient, days
Mean (SD)	597.8 (283.1)	531.0 (307.1)
Median (Q1:Q3)	610 (409:807)	560 (355:764)
Range	2–1128	0–1128
All-cause deaths	37	42
1-year survival	0.873 (0.823 to 0.925) (n=133)	0.833 (0.778 to 0.893) (n=122)
2-year survival	0.773 (0.706 to 0.847) (n=58)	0.725 (0.652 to 0.807) (n=50)
Subsequent intervention, patients
Mitral valve replacement	6	6
Mitral valve repair	2	2
Other mitral intervention	1	0
Cardiac pacemaker insertion	10	12
Cardioverter defibrillator	2	3