Efficacy of modified pancreatic duct stent drainage during endoscopic retrograde cholangiopancreatography for common bile duct stones

Table 3 Comparison of visual analogue scale scores among the three groups of patients, mean ± SD

	Modified pancreatic duct stent drainage group (n = 59)	Nasobiliary drainage group (n = 58)	Standard biliary drainage group (n = 58)	F value	P value	P1 value	P2 value	P3 value
VAS (point)
24 hours before the surgery	6.25 ± 2.16	6.24 ± 2.45	6.26 ± 2.54	0.077	0.781
24 hours after the surgery	4.36 ± 1.18	5.54 ± 1.24	4.92 ± 1.68	10.416	< 0.001	< 0.001	0.017	0.033

P1 represents the comparison between the modified pancreatic duct stent drainage group and nasobiliary drainage group. P2 represents the comparison between the nasobiliary drainage group and standard biliary drainage group. P3 represents the comparison between the standard biliary drainage group and modified pancreatic duct stent drainage group. VAS: Visual analogue scale.