Nasobiliary drainage after endoscopic papillary balloon dilatation may prevent postoperative pancreatitis

Table 2 Baseline characteristics of the subgroups

Variable	EPBD (n = 77)			EST (n = 73)			Neither EPBD nor EST (n = 68)
	G1a (n = 41)	G2a (n = 36)	P value	G1b (n = 34)	G2b (n = 39)	P value	G1c (n = 38)	G2c (n = 30)	P value
Age (yr)	59.6 ± 9.7	59.3 ± 10.4	0.8963	58.4 ± 10.1	59.9 ± 10.9	0.5419	61.4 ± 9.9	56.9 ± 10.1	0.0559
Sex, male/female	21/20	24/12	0.1700	23/11	25/14	0.7502	24/14	22/8	0.3732
Presence of gallstones (n)	4	2	0.7948	5	4	0.8259	4	3	0.7407
History of cholecystectomy (n)	3	3	0.7948	2	4	0.8013	2	2	0.7835
Total leukocyte count (× 109/L)	5.9 ± 1.9	6.0 ± 2.2	0.8321	5.4 ± 2.3	5.9 ± 2.1	0.3347	5.8 ± 1.7	6.1 ± 2.4	0.5304
Amylase (U/L)	84.5 ± 23.4	89.2 ± 24.7	0.3932	89.1 ± 25.6	87.1 ± 27.2	0.7464	87.3 ± 26.2	92.0 ± 27.2	0.4526
TB (mg/dL)	4.7 ± 1.1	4.6 ± 0.9	0.6736	4.1 ± 0.7	3.9 ± 0.9	0.2863	3.6 ± 0.9	3.7 ± 1.0	0.6465
ALT (IU/L)	127.4 ± 35.1	118.9 ± 33.4	0.2766	123.1 ± 33.1	125.1 ± 37.4	0.8085	117.9 ± 31.4	113.9 ± 32.7	0.5943
AST (IU/L)	100.6 ± 29.3	101.6 ± 24.1	0.8716	97.9 ± 24.3	100.7 ± 24.9	0.6273	98.1 ± 21.3	103.7 ± 24.1	0.2919
Prothrombin time (s)	12.3 ± 1.9	11.9 ± 2.3	0.4093	10.3 ± 1.7	10.9 ± 2.0	0.1659	11.3 ± 1.8	11.6 ± 1.7	0.4661
Platelet count (× 106/L)	139.2 ± 44.1	142.1 ± 38.4	0.7577	143.5 ± 40.1	146.1 ± 41.3	0.7852	147.5 ± 39.1	153.5 ± 42.1	0.5280
Maximum diameter of CBD (mm)	11.5 ± 2.3	12.1 ± 2.1	0.2316	12.3 ± 2.0	12.9 ± 1.9	0.1907	11.7 ± 1.8	12.5 ± 2.1	0.0797

EPBD: Endoscopic papillary balloon dilatation; EST: Endoscopic sphincterotomy; TB: Total serum bilirubin; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase; CBD: Common bile duct.