Resection of pancreatic cystic neoplasms in recurrent acute pancreatitis prevents recurrent pancreatitis but does not identify more malignancies

Table 2 Incidence of recurrent acute pancreatitis episodes in recurrent acute pancreatitis patients

	Episodes per patient-year (mean + SD)		Mean difference [95%CI]	P value
	Pre-resection	Post-resection
All cysts (n = 29)	3.40 (4.46)	0.02 (0.08)	3.38 [1.76, 5.00]	< 0.0001
IPMN (n = 23)	2.32 (1.69)	0.03 (0.09)	2.29 [1.60, 2.98]	< 0.0001
BD-IPMN (n = 15)	2.06 (1.85)	0.04 (0.11)	2.02 [1.08, 2.96]	< 0.0001
MD-IPMN (n = 8)	2.81 (1.32)	0 (0)1	2.81 [1.83, 3.79]	< 0.0001
Non-IPMN (n = 6)	7.52 (8.53)	0 (0)1	7.52 [0.69, 14.35]	0.03

¹In order to calculate mean differences and risk ratios, a standard deviation of 0.0001 was substituted for zero. IPMN: Intra-ductal papillary mucinous neoplasm; MD-IPMN: Main duct-IPMN; BD-IPMN: Branch duct-IPMN; SD: Standard deviation; CI: Confidence interval.