Variables

Frequency

Percentage

Type of studies

Quantitative studies

10

45.5

Qualitative studies

11

50

Mixed method study

1

4.5

Data collection tools

Questionnaire

10

45.5

In depth interview

4

18.1

Focus group discussion

6

27.3

Questionnaires and screening

1

4.5

Test

1

4.5

Unknown

Sampling methods

Convenience

4

18.1

Snowball

5

22.7

Purposive

11

50

Random

1

4.5

Stratified

1

4.5