Table 2 Predefined outcome of included studies

Alhazzani 2017 [18]

4/49

3/42

17/49

13/42

10/49

6/42

2/49

1/42

10/49

6/42

9 (5–17)

6.5 (4–14)

12 (8–23)

8.5 (6–18)

El-Kersh 2017 [29]

1/55

1/47

7/55

8/47

-

-

1/55

3/47

4 (2.2–7)

5 (3–8)

6 (4–6.9)

7 (3.5–11.5)

Selvanderan 2016 [27]

3/106

6/108

30/106

25/108

12/106

8/108

1/106

0/108

12/106

8/108

21 (0–25)

21 (4–25)

6 (3–11)

7 (4–14)

Lin 2016 [28]

0/60

6/60

2/60

0/60

4/60

6/60

-

-

4/60

6/60

-

-

-

-

Ben-menachem 1994 [22]

10/200

6/200

45/200

19/100

25/200

6/100

-

-

7.3 (8.9)/8.1 (1.1)

7.9 (9.6)

3 (2–8.5)/4 (2–9)

3 (2–8)

Apte 1992 [21]

5/16

6/18

11/16

7/18

11/16

7/18

-

-

-

-

-

-

Van den Berg 1985 [23]

5/14

1/14

-

-

-

-

-

-

-

-

-

-