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Table 1 Baseline characteristics of the studies included in the meta-analysis

From: Laparoscopic liver resection as a safe and efficacious alternative to open resection for colorectal liver metastasis: a meta-analysis

Author

Year

Country

Group

No. of patients

M/F

Age, year (range and/or SD)

MH

Tumor size, cm (range and/or SD)

No. of tumor (range and/or SD)

Conversions (n [%])

Study quality

Mala et al. [9]

2002

Norway

LLR

13

4/9

68 (55–73)

2

2.6 (1–6)

2 (1–7)

0

*****

OLR

14

4/10

59 (24–74)

2

3 (1.5-9)

1 (1–4)

Castaing et al.[10]

2009

France

LLR

60

37/23

62 ± 11

26

3.3 ± 1.1

2.2 ± 2.3

6 (10)

*******

OLR

60

37/23

62 ± 11

24

4.4 ± 3.8

2.2 ± 1.98

Abu et al. [11]

2010

United Kingdom

LLR

50

28/22

66 (42–85)

19

3.15 (0.3–9)

1 (1–3)

6 (12)

******

OLR

85

55/30

67 (47–86)

46

–

–

Cheung et al. [12]

2012

Hong Kong

LLR

20

13/7

57.5 (42–74)

1

1.5 (0.5–4.5)

1 (1–2)

0

*******

OLR

40

29/11

64 (29–83)

2

2.2 (0.5–7)

1 (1–2)

Cannon et al. [13]

2012

United States

LLR

35

–

62 ±10

19

4 ±3

1 ± 1

–

*******

OLR

138

–

62 ±11

71

5 ± 3

1 ± 1

Topal et al. [14]

2012

Belgium

LLR

20

10/10

57.6

20

4 (0.4–7)

2 (1–6)

–

******

OLR

20

8/12

66.0

20

3.2 (1–12.5)

2 (1–14)

Guerron et al. [15]

2013

United States

LLR

40

21/19

66.2 ± 1.9

5

3.3 ± 0.3

1.3 ± 0.1

2 (5)

*******

OLR

40

15/25

62.2 ± 1.8

9

3.2 ± 0.3

1.7 ± 0.1

Qiu et al. [16]

2013

China

LLR

30

14/16

52.5 ± 11.5

2

2.5 ± 2.0

≥2 (n=10)

2 (6.6)

********

   

OLR

30

15/15

–

5

2.8 ± 1.5

≥2 (n=9)

  
  1. LLR laparoscopic liver resection, OLR open liver resection, M/F Male/Female, MH major hepatectomy ( ≥ 3 segments of the liver). *Newcastle-Ottawa Scale.