Table 2.

Adverse event rates, ORs and 95% CIs of hospitals with or without a 30-day follow-up frequency of cholecystectomies ≥90%

	Adverse events		P value
	≥90%	<90%
	n=83 067	n=12 773
	n (%)	n (%)
Intraoperative	2548 (3.0)	381 (3.0)	0.8826
Total postoperative	6681 (8.0)	1119 (8.8)	0.0057
Pancreatitis	455 (0.6)	66 (0.5)	0.6570
Bleeding	629 (0.8)	96 (0.8)	0.9454

	≥90% vs <90% 30 day follow-up Adjusted*
	OR	95% CI	P value
Intraoperative	0.93	0.84 to 1.04	0.2298
Total postoperative	0.98	0.91 to 1.05	0.5067
Pancreatitis	1.30	0.99 to 1.75	0.0606
Bleeding	0.97	0.78 to 1.21	0.7821

Figures in bold are statistically significant.

*Adjusted for sex, age, ASA class, acute interventions and indications.

ASA, American Society of Anesthesiologists.