Table 1

Multivariable modelling of postoperative outcomes using preoperative and operative factors

Predictor	Missing	Category	Hospital mortality		Return to theatre for bleeding		New stroke		Post-operative length of stay (days)
Predictor	Missing	Category	OR	P value	OR	P value	OR	P value	OR	P value
Age (years)	7.9%	Per unit increase	1.03 (1.02–1.04)	<0.001	1.01 (1.00–1.01)	0.006	1.02 (1.01–1.03)	0.001	1.00 (1.00–1.00)	<0.001
Gender	10.3%	Female	-		-		-		-
		Male	0.63 (0.51–0.77)	<0.001	1.18 (1.02–1.36)	0.026	1.02 (0.80–1.29)	0.89	0.94 (0.93–0.96)	<0.001
LVEF	3.1%	Good (>50%)	–		–		–		–
LVEF		Moderate (30%–50%)	1.48 (1.18–1.85)	0.001	1.08 (0.91–1.27)	0.38	1.13 (0.86–1.48)	0.38	1.08 (1.06–1.10)	<0.001
		Poor (<30%)	1.90 (1.36–2.69)	<0.001	1.10 (0.82–1.48)	0.53	0.78 (0.44–1.38)	0.40	1.07 (1.03–1.11)	0.001
EuroSCORE logistic	12.1%	Per unit increase	1.02 (1.02–1.03)	<0.001	1.01 (1.00–1.01)	0.16	1.00 (0.99–1.02)	0.30	1.01 (1.01–1.01)	<0.001
Operative urgency	0.02%	1.Elective	–		–		–		–
Operative urgency		2.Urgent	1.63 (1.30–2.00)	<0.001	1.26 (1.08–2.00)	0.002	1.08 (0.83–1.41)	0.55	1.18 (1.16–1.20)	<0.001
		3.Emergency	6.87 (4.70–10.16)	<0.001	2.22 (1.51–3.26)	<0.001	7.65 (5.00–11.70)	<0.001	1.78 (1.67–1.90)	<0.001
		4.Salvage	11.79 (5.73–24.27)	<0.001	1.51 (0.56–4.02)	0.41	4.38 (1.47–13.1)	0.008	1.25 (1.07–1.46)	0.006
Cumulative bypass time (mins)	2.4%	Per unit increase	1.02 (1.01–1.02)	<0.001	1.00 (1.00–1.01)	<0.001	1.00 (1.00–1.01)	<0.001	1.00 (1.00–1.00)	<0.001
Cumulative cross clamp tme (mins)	2.5%	Per unit increase	0.99 (0.99–0.99)	<0.001	1.00 (1.00–1.00)	0.23	1.00 (0.99–1.00)	0.58	1.00 (1.00–1.00)	0.78
CABG	0%	No	–		–		–		–
		Yes	1.15 (0.93–1.42)	0.20	1.07 (0.93–1.24)	0.33	1.12 (0.88–1.42)	0.37	1.03 (1.00–1.05)	<0.001

CABG, coronary artery bypass graft surgery; LVEF, left ventricular ejection fraction.