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Overview of the studies included in the review.
| Characteristics | Number of studies (n = 9) | Characteristics | Number of studies (n = 9) |
|---|---|---|---|
| Country | Study design | ||
| Taiwan | 7 | Cross-sectional | 3 |
| Pakistan | 1 | Quasi experimental | 1 |
| Thailand | 1 | Longitudinal | 2 |
| Randomized control trail | 1 | ||
| Cluster randomized control trail | 2 | ||
| Data type | Sample size | ||
| Primary | 8 | <500 | 6 |
| Secondary | 1 | 500–1000 | 1 |
| >1000 | 2 | ||
| Study setting | |||
| Community based | 8 | ||
| Facility based | 1 |
