Table 1 The frequency of different types of study

RCT

21

44.9%

[22, 23, 29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47]

Before-after study

10

18.4%

[48,49,50,51,52,53,54,55,56,57]

Descriptive study

9

18.4%

[25, 58,59,60,61,62,63,64,65]

Cross-sectional study

2

4.1%

[66, 67]

Mixed method

2

4.1%

[68, 69]

Cohort

1

2.0%

[24]

Non-Randomized trials

1

2.0%

[70]

Quasi-experimental study

1

2.0%

[71]

Sequential prospective study

1

2.0%

[72]

Time-series analysis

1

2.0%

[73]