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Table 1 Basic characteristics of the included studies

From: Efficacy of preoperative biliary drainage in malignant obstructive jaundice: a meta-analysis and systematic review

Number

Study/year

Country

Type of study

Type of drainage

Sex, M/F

Total number of patients in the study

N-PBD

N-DS

1

Morris-Stiff et al. 2011 [20]

UK

Prospective cohort analysis

Internal and External

152/128

280

118

162

2

van der Gaag et al. 2010 [21]

USA

Randomized controlled trial

Internal and External

119/83

202

106

96

3

Coates et al. 2009 [22]

USA

Retrospective cohort analysis

Internal and External

48/42

90

56

34

4

Anderson et al. 2004 [23]

Republic of South Africa

Single center observational study

Internal and External

4/2

6

6

0

5

Pisters et al. 2001 [24]

USA

Retrospective cohort analysis

Internal and External

164/136

300

207

93

6

Sewnath et al. 2001 [25]

Netherlands

Retrospective cohort analysis

Internal

148/142

290

232

58

7

Martignoni et al. 2001 [26]

Switzerland

Retrospective cohort analysis

Internal and external

140/117

257

99

158

8

Sohn et al. 2000 [27]

USA

Retrospective cohort analysis

Internal and External

297/270

567

408

159

9

Figueras et al. 2000 [28]

Spain

Retrospective cohort analysis

External

−

20

11

9

10

Wig et al. 1999 [29]

India

Randomized controlled trial

External

20/20

40

20

20

11

Povoski et al. 1999 [30]

USA

Retrospective cohort analysis

Internal and external

134/106

240

126

114

12

Hochwald et al. 1999 [31]

USA

Retrospective cohort analysis

Internal and external

40/31

71

42

29

13

Heslin et al. 1998 [32]

USA

Retrospective cohort analysis

Internal and external

41/33

74

39

35

14

Marcus et al. 1998 [33]

USA

Retrospective cohort analysis

Internal

32/20

52

22

30

15

Karsten et al. 1996 [34]

Netherlands

Retrospective cohort analysis

Internal and external

152/89

241

184

57

16

Chou et al. 1996 [35]

Taiwan

Randomized controlled trial

Internal and external

50/43

93

26

67

17

Lai et al. 1994 [36]

Hong Kong

Randomized controlled trial

Internal

59/28

87

43

44

18

Bakkevold et al. 1993 [37]

Norway

Retrospective cohort analysis

Internal and external

−

108

35

73

19

Sirinek and Levine 1989 [38]

USA

Retrospective cohort analysis

Internal and external

−

138

84

54

20

Lygidakis et al. 1987 [39]

Netherlands

Retrospective cohort analysis

Internal

21/17

38

19

19

21

Pitt et al. 1985 [40]

USA

Randomized controlled trial

Internal and external

45/30

79

37

38

22

Smith et al. 1985 [41]

Australia

Randomized controlled trial

Internal and external

20/10

30

15

15

23

Gundry et al. 1984 [42]

USA

Retrospective cohort analysis

Internal and external

−

50

25

25

24

McPherson et al. 1984 [43]

UK

Randomized controlled trial

External

−

65

34

31

25

Hatfield et al. 1982 [44]

UK

Randomized controlled trial

External

−

57

28

27

26

Denning et al. 1981 [45]

USA

Retrospective cohort analysis

Internal and external

29/28

57

25

32

  1. N-PBD number of patients in the preoperative biliary drainage group, N-DS number of patients in direct surgery group