Elderly patients (≥ 80 years) with acute calculous cholangitis have similar outcomes as non-elderly patients (< 80 years): Propensity score-matched analysis

Table 3 Subgroup analysis of patients who had endoscopic retrograde cholangiopancreatography on outcomes in elderly vs and non-elderly patients

	Overall cohort, n = 292				PSM cohort, n = 142
	Elderly, n = 206	Non-elderly, n = 86	OR, 95%CI	P value	Elderly, n = 77	Non-elderly, n = 65	OR, 95%CI	P value
Timing of ERCP from presentation				0.012			-	0.247
Within 24 h	15 (7.3)	16 (18.6)			9 (11.7)	12 (18.5)
24-48 h	36 (17.5)	13 (15.1)			14 (18.2)	11 (16.9)
48-72 h	34 (16.5)	19 (22.1)			12 (15.6)	16 (24.6)
>72 h	121 (58.7)	38 (44.2)			42 (54.6)	26 (40)
Stone(s) removed	102 (49.5)	44 (51.2)	0.94 (0.57, 1.55)	0.797	36 (46.8)	30 (46.2)	1.02 (0.53, 1.99)	0.943
Stent placed	89 (43.2)	38 (44.2)	0.96 (0.58, 1.60)	0.877	35 (45.5)	30 (46.2)	0.97 (0.50, 1.89)	0.934
Length of hospital stay, d	9 (7, 13)	8 (5, 11)	-	0.016	8 (5, 12)	8 (5, 12)	-	0.546
In-hospital mortality	2 (1)	1 (1.2)	0.83 (0.08, 9.31)	0.882	1 (1.3)	1 (1.5)	0.84 (0.05, 13.73)	0.904
30-d mortality	13 (6.3)	4 (4.7)	1.38 (0.44, 4.36)	0.581	3 (3.9)	4 (6.2)	0.62 (0.13, 2.87)	0.536
90-d mortality	16 (7.8)	4 (4.7)	1.73 (0.56, 5.32)	0.337	3 (3.9)	4 (6.2)	0.62 (0.13, 2.87)	0.536

All continuous variables were expressed as median (interquartile range) unless specified. All categorical variables were expressed as n (%) unless otherwise specified. ERCP: Endoscopic retrograde cholangiopancreatography; CI: Confidence interval; OR: Odds ratio; PSM: Propensity score matching.