Table 4 Distribution of papers based on study design
Row Labels | Frequency |
|---|---|
Experimental | 23 |
 Before-after Design | 1 |
 Quasi-experimental | 3 |
 Non-randomized controlled trial | 1 |
 Randomized controlled trial | 18 |
Observational-analytical | 6 |
 Cross sectional study | 2 |
 Observational study without control | 4 |
Total | 29 |