Table 1 Characteristics of included studies

Atim 2011

Hysterectomy

TAP

18

0.25% bupivacaine, 20 ml each side

2.5 ± 1.7

2.0 ± 2.1

0.3 ± 0.4

2.8 ± 1.7

2.4 ± 1.7

0.3 ± 0.4

LAI

19

0.25% bupivacaine, 20 ml total

3.7 ± 2.2

2.7 ± 1.3

1.0 ± 0.9

4.1 ± 2.6

2.8 ± 1.3

1.2 ± 0.9

Sivapurapu 2013

Gynecological surgery

TAP

26

0.25% bupivacaine 0.6 ml/kg, total

4.0 ± 1.3

3.6 ± 0.8

3.5 ± 0.7

22.15 ± 4.14

4

LAI

26

0.25% bupivacaine 0.6 ml/kg, total

6.7 ± 1.4

5.1 ± 0.7

4.7 ± 0.6

29.15 ± 3.93

23

Petersen 2013

Inguinal hernia repair

TAP

29

0.75% ropivacaine, 25 ml each side

2.8 ± 1.5

3.1 ± 1.8

1.7 ± 1.3

4.3 ± 1.8

4.6 ± 1.9

3.7 ± 1.8

6.6 ± 11.5

17

LAI

30

0.375% ropivacaine, 40 ml total

0.8 ± 1.1

1.2 ± 1.3

2.0 ± 1.5

1.3 ± 1.6

2.0 ± 1.8

4.5 ± 2.3

2.1 ± 5.1

20

Skjelsager 2013

Open radical prostatectomy

TAP

23

0.75% ropivacaine, 40 ml total

1.8 ± 1.6

1.2 ± 1.3

0.6 ± 1.0

2.9 ± 2.3

2.8 ± 2.2

1.6 ± 1.4

30

LAI

25

0.75% ropivacaine, 40 ml total

2.0 ± 1.5

1.6 ± 1.2

0.9 ± 0.8

3.8 ± 2.1

3.3 ± 1.8

2.5 ± 1.9

25