Effect of preoperative biliary drainage on malignant obstructive jaundice: A meta-analysis

Table 1 Characteristics of 14 studies included in this study

Study	Yr	Type of drainage	Patients (n)
Hochwald et al[9]	1999	Internal and external	71
Martignoni et al[10]	2001	Internal and external	30
Pisters et al[11]	2001	Internal and external	255
Srivastava et al[12]	2001	Internal and external	95
Hodul et al[13]	2003	Internal	212
Pešková et al[14]	2005	Internal	304
dos Santos et al[15]	2005	Internal	53
Tsai et al[16]	2006	Internal and external	303
Barnett et al[17]	2006	Internal	104
Bhati et al[18]	2007	Internal	50
Choi et al[19]	2008	Internal and external	49
Ferrero et al[20]	2009	Internal and external	60
Abdullah et al[21]	2009	Internal and external	82
Li et al[22]	2009	Internal and external	140
Total			1826