Table 3. Impact of preoperative serum aminotransferase levels on 90-day mortality.

	Death	Patients	Cumulative mortality	Unadjusted	Multivariable adjusted
	No.	No.	Rate (95% CI)	Hazard ratio (95% CI)	Hazard ratio (95% CI)
ALT
Low (≤13 IU/L)	77	1528	5.0 (3.9–6.1)	2.25 (1.65–3.08)‡	1.58 (1.14–2.18)†
Middle (13–30 IU/L)	80	3512	2.3 (1.8–2.8)	1 (reference)	1 (reference)
High (>30 IU/L)	26	1224	2.1 (1.3–2.9)	0.93 (0.60–1.45)	0.95 (0.60–1.49)
AST
Low (≤17 IU/L)	46	1384	3.3 (2.4–4.3)	1.45 (1.02–2.08)*	1.31 (0.91–1.89)
Middle (17–30 IU/L)	85	3687	2.3 (1.8–2.8)	1 (reference)	1 (reference)
High (>30 IU/L)	52	1193	4.4 (3.2–5.5)	1.91 (1.35–2.70)‡	1.39 (0.96–2.01)
De Ritis ratio
Low (≤0.85)	17	1274	1.3 (0.7–2.0)	0.57 (0.34–0.96)*	0.74 (0.44–1.25)
Middle (0.85–1.62)	87	3745	2.3 (1.8–2.8)	1 (reference)	1 (reference)
High (>1.62)	79	1245	6.3 (5.0–7.7)	2.79 (2.05–3.78)‡	1.59 (1.15–2.20)†

^*P<0.05, ^†P<0.01, ^‡P<0.001.

SI conversion factors: To convert ALT and AST to μkat/L, multiply values by 0.0167.

ALT: alanine aminotransferase; AST: aspartate aminotransferase; CI: confidence interval.