Table 2 Quality of studies using Joanna Briggs Institute (JBI) criteria
References | Criteria for inclusion in the sample clearly defined | Study subjects and the setting described in detail | Exposure measured in a valid and reliable way | Objective, standard criteria used for measurement of the condition | Confounding factors identified | Strategies to deal with confounding factors stated | Outcomes measured in a valid & reliable way | Appropriate statistical analysis used | Scores | Overall quality |
|---|---|---|---|---|---|---|---|---|---|---|
1. Rwegerera et al. [21] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
2. Tusa et al. [22] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
3. Gebremedhin et al. [14] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
4. Reba et al. [20] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
5. Aschalew et al. [10] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
6. Muze et al. [18] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
7. Ababio et al. [9] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
8. Jannoo et al. [16] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
9. Ekwunife et al. [13] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
10. Bolarinwa et al. [11] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
11. Odili et al. [6] | Yes | Yes | Yes | Yes | No | No | Yes | No | 5 | Low risk |
12. James et al. [15] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
13. Werfalli et al. [23] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
14. Daya et al. [12] | Yes | Yes | Yes | Yes | No | No | Yes | No | 5 | Low risk |
15. Mngomezulu et al. [17] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |
16. Nyanzi et al. [19] | Yes | Yes | Yes | Yes | No | Yes | Yes | Yes | 7 | Low risk |