Table 1.
Characteristics of Included Studies
| Author/year | Region/study site | Study setting | Sample size | Study design and instrument | Screened proportion |
| Ndikom and Ofi (2012) | Southwest/Ibadan, Oyo State | Health facility | 82 | Qualitative/FGD | NS |
| Titiloye et al. (2017) | Southwest/Ondo town, Ondo State |
Community based | 244 | Cross-sectional/Questionnaire | 28(15.6%) |
| Abiodun et al. (2013) | Southwest/across 20 LGA, Ogun State |
Community based | 2000 | Cross-sectional/Questionnaire | 27(1.4%) |
| Isa Modibbo et al. (2016) |
North-central/Abuja and Southwest/Ondo State |
Health facility | 49 | Qualitive/FGD | 19(38.8) |
| Amu et al. (2017) | Southwest/Somolu LGA, Lagos State |
Community based | 260 | Cross-sectional/Questionnaire | 26 (10%) |
| Chigbu and Aniebue. (2011) |
Southeast/Enugu State | Health facility | 3712 | Cross-sectional/Questionnaire | 389(10.5%) |
| Nwankwo et al. (2011) | Southeast/Ugbawka, Ozalla and Ijinike communities, Enugu State |
Religious institution |
815 | Cross-sectional/Questionnaire | 34(4.2%) |
| Ogwunga et al. (2020) | Southeast/Imo State | Educational institution |
398 | Mixed method/Questionnaire | 17(4.3%) |
| Ezem (2007) | Southeast/Owerri, Imo State | Community based | 846 | Cross-sectional/Questionnaire | 60(7.1%) |
| Amos and Awolude (2019) |
Southwest/Ibadan, Oyo State | Health facility | 85 | Cross-sectional/Questionnaire | 23(27.1%) |
| Bammeke and Ndikom (2014) |
Southwest/Ibadan, Oyo State | Health facility | 100 | Cross-sectional/Questionnaire | 5% |
| Hyacinth et al. (2012) | North-central/Jos, Plateau State | Federal non-healthcare establishment |
388 | Cross-sectional/Questionnaire | 34(10.2%) |
| Leo et al. (2020) | North-central/Abuja | Health facility | 289 | Cross-sectional/Questionnaire | 105(36.3%) |
| Okunowo and Smith- Okonu (2020) |
Southwest/Surulere LGA, Lagos State |
Health facility | 522 | Cross-sectional/Questionnaire | 92(18.4%) |
| Ndikom, Ajibade, and Oluwasola (2020) |
Southwest/Ibadan, Oyo State | Health facility | 205 | Cross-sectional/Questionnaire | 33(16.1%) |
NS = Not specified