Table 1.
Descriptive statistics (estimates) of the features of the articles included in the systematic review
| Variable | Category A | Category B (who region) | Number of articles | % |
|---|---|---|---|---|
| Countries | Nigeria | Africa | 19 | 20.43 |
| Cameroon | Africa | 3 | 3.23 | |
| Cote d’Ivoire | Africa | 1 | 1.08 | |
| Mali | Africa | 1 | 1.08 | |
| Kenya | Africa | 8 | 8.60 | |
| Senegal | Africa | 4 | 4.30 | |
| United State of America | The Americas | 3 | 3.23 | |
| South Africa | Africa | 2 | 2.15 | |
| Switzerland | Europe | 22 | 23.66 | |
| Netherlands | Europe | 1 | 1.08 | |
| Swaziland | Africa | 1 | 1.08 | |
| United Kingdom | Europe | 3 | 3.23 | |
| Yemen | Eastern Mediterranean | 1 | 1.08 | |
| Malawi | Africa | 1 | 1.08 | |
| Niger | Africa | 1 | 1.08 | |
| Ghana | Africa | 1 | 1.08 | |
| Burkina Faso | Africa | 1 | 1.08 | |
| Zimbabwe | Africa | 1 | 1.08 | |
| Zambia | Africa | 1 | 1.08 | |
| Angola | Africa | 1 | 1.08 | |
| Tanzania | Africa | 1 | 1.08 | |
| Ethiopia | Africa | 2 | 2.15 | |
| Others | 14 | 15.05 | ||
| Type of Article | Research | 61 | 65.59 | |
| Review | 6 | 6.45 | ||
| Technical report | 22 | 23.66 | ||
| Online article | 4 | 4.30 | ||
| *Sample year | 1984─1993 | 4 | 6.56 | |
| 1994─2003 | 4 | 6.56 | ||
| 2004─2017 | 44 | 72.13 | ||
| Not reported | 9 | 14.75 | ||
| *Sampling method | Cluster | 2 | 3.28 | |
| Random | 19 | 31.15 | ||
| Universal/census | 4 | 6.56 | ||
| Stratified | 2 | 3.28 | ||
| Not reported | 33 | 54.09 | ||
| Fish bowl/ systematic | 1 | 1.64 | ||
| *Study type | Cross-sectional | 40 | 65.58 | |
| Longitudinal | 5 | 8.19 | ||
| Not reported | 16 | 26.23 | ||
| *Sample size determination | Yes | 11 | 18.03 | |
| Not reported | 30 | 49.18 | ||
| Could not be ascertained | 20 | 32.78 | ||
| *Setting | School | 39 | 63.93 | |
| Community | 9 | 14.75 | ||
| Others | 13 | 21.31 | ||
| *Population area | Rural | 37 | 60.66 | |
| Peri-urban | 7 | 11.48 | ||
| Others | 17 | 27.87 | ||
| **Mode of diagnosis | Microscope only | 18 | 43.90 | |
| Real time PCR Assays + Reagent strip + Test for cSEA + microscopy | 1 | 2.44 | ||
| Reagent strip only | 1 | 2.44 | ||
| Microscopy and Reagent strip | 21 | 51.22 | ||
| **Format of intensity | Arithmetic mean only | 5 | 12.19 | |
| Geometric mean only | 3 | 7.32 | ||
| WHO categories only | 13 | 31.71 | ||
| Geometric+ WHO categories | 1 | 2.44 | ||
| Not reported/Not specified | 19 | 46.34 |
*Only applicable to research articles; **Only applicable to prevalence/ intensity studies on humans; cSEA, Circulating Soluble Egg Antigen