Table 2. Assessment of the quality of the studies included in the review based on Effective Public Health Practice Project: Quality assessment tool for quantitative studies.
| No. | Author, Year | SelectionBias | Study Design | Confounders | Blinding | Data Collection Methods | Withdrawals and Drop-Outs | Final Rating |
|---|---|---|---|---|---|---|---|---|
| 1 | Ateba-Ngoaet al., 2015 | 2 | 3 | 3 | 2 | 1 | NA | 2 |
| 2 | Briand et al. 2005 | 2 | 2 | 1 | 2 | 1 | 1 | 2 |
| 3 | Courtin et al. 2011 | 2 | 2 | 3 | 2 | 1 | 3 | 3 |
| 4 | Deribew et al. 2013 | 2 | 3 | 3 | 2 | 1 | NA | 3 |
| 5 | Doumbo et al. 2014 | 1 | 2 | 1 | 2 | 1 | 1 | 1 |
| 6 | Florey et al. 2012 | 3 | 3 | 2 | 2 | 1 | NA | 3 |
| 7 | Kabatereineet al. 2011 | 2 | 3 | 2 | 2 | 2 | NA | 2 |
| 8 | Lyke et al. 2005 | 3 | 2 | 1 | 2 | 1 | 1 | 2 |
| 9 | Mazigo et al. 2010 | 2 | 3 | 3 | 2 | 1 | NA | 3 |
| 10 | Lemaitre et al. 2014 | 2 | 2 | 1 | 2 | 1 | 3 | 2 |
| 11 | Sangweme et al. 2010 | 1 | 2 | 2 | 2 | 1 | 3 | 2 |
| 12 | Sokhna et al. 2004 | 2 | 2 | 2 | 2 | 1 | 1 | 1 |
1 = strong 2 = moderate 3 = weak NA = not applicable