Table 2 The general characteristics of the included studies in the systematic review

Hostovsky [24]

2020

Good

57.7

SO = 20

Off

1.5 -2.5

6

*

Rabina [27]

2019

Excellent

56.1

SO = 41

On

3- 6

1

*

Takkar [25]

2017

Good

39.6

SO = 32

Off

3–6

6–9

*

Roohipoor [26]

2020

Excellent

54

SO = 45

Off

3

–

*

Kheir [29]

2018

Good

48.1

SO = 10

On

3

9

*

Tode [28]

2016

Fair

61

SO = 15

On

1.5

36

*

Caramoy [34]

2014

Fair

67

SO = 9

On

5

–

*

Christensen [8]

2011

Fair

51

SO = 9

Gas = 7

On

5

46

*

Inan [31]

2016

Good

60.7

SO = 28

Gas = 30

Off

4

8

*

*

Goker [14]

2017

Good

56.35

SO = 20

Gas = 16

Off

4

2

*

*

Lee [15]

2017

Good

46.83

SO = 33

Gas = 31

On

3.5

6

*

*

Purtskhvanidze [30]

2017

Good

59.3

SO = 20

Gas = 20

Off

5.5

35

*

*

Zhou [17]

2020

Good

53.86

SO = 7

Gas = 14

On

4

–

*

*

Mirza [32]

2018

Fair

60.4

SO = 24

Off

3–6

1

*

Karimi [16]

2018

Good

52

SO = 60

Off

6–9

3

*

Odrobino [33]

2016

Good

62.44

SO = 18

Off

6

-

*