Table 2.

Baseline patient characteristics of included trials

Study	Patients (n)		Age (year in mean)		Female		Malignant jaundice		CBD stone		SOD
	E	Std	E	Std	E	Std	E	Std	E	Std	E	Std
Cennamo et al[13]	36	110	681	711	55.5%	53.6%	33.3%	25.4%	66.6%	74.5%	0	0
Tang et al[15]	32	30	64.6	67.2	53.1%	53.3%	34.3%	33.3%	21.9%	13.3%	3.1%	6.7%
Khatibian et al[14]	106	112	56.6	55.9	53.8%	67%	N/A	N/A	51.9%	68.8%	21.2%	12.8%
de Weerth et al[12]	145	146	66	64	66%	66%	40%	23%	46.8%	59.5%	N/A	N/A
Zhou et al[11]	43	48	62.7	64.3	39.5%	39.5%	30.2%	25%	20.9%	22.9%	N/A	N/A
Manes et al[10]	77	74	66	65	35%	35.1%	33.7%	40.5%	53.2%	41.9%	0	2.7%
Swan et al[16]	39	34	59	57	72%	66%	N/A	N/A	10.3%	17.6%	5.1%	8.8%

¹Age in median year. E: Early pre cut; Std: Standard method of cannulation; N/A: Data not available; CBD: Common bile duct; SOD: Sphincter of oddi dysfunction.