Table 1.

Baseline characteristics for matched cohorts

	Identifiable linkage (n=166)	Non-identifiable linkage (n=169)
Female gender	52 (31.3%)	50 (26.6%)
Median age, years (Q1:Q3)	78.5 (69:85)	78 (68:85)
Diabetes	30 (18.1%)	34 (20.1%)
Critical pre-op status	3 (1.8%)	4 (2.4%)
Functional/ischaemic aetiology	100 (61.7%)	103 (60.9%)
Urgent/emergency procedure	20 (12.0%)	19 (11.2%)

*Note that diabetes status which included any of the following was converted to presence of diabetes: diabetes (dietary control), diabetes (oral medicine), diabetes (insulin), newly diagnosed diabetes.