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 | Â | 14 | 15.05 | |
Type of Article | Research | Â | 61 | 65.59 |
Review | Â | 6 | 6.45 | |
Technical report | Â | 22 | 23.66 | |
Online article | Â | 4 | 4.30 | |
*Sample year | 1984─1993 |  | 4 | 6.56 |
|  | 1994─2003 |  | 4 | 6.56 |
|  | 2004─2017 |  | 44 | 72.13 |
| Â | Not reported | Â | 9 | 14.75 |
*Sampling method | Cluster | Â | 2 | 3.28 |
Random | Â | 19 | 31.15 | |
Universal/census | Â | 4 | 6.56 | |
Stratified | Â | 2 | 3.28 | |
Not reported | Â | 33 | 54.09 | |
Fish bowl/ systematic | Â | 1 | 1.64 | |
*Study type | Cross-sectional | Â | 40 | 65.58 |
Longitudinal | Â | 5 | 8.19 | |
Not reported | Â | 16 | 26.23 | |
*Sample size determination | Yes | Â | 11 | 18.03 |
Not reported | Â | 30 | 49.18 | |
Could not be ascertained | Â | 20 | 32.78 | |
*Setting | School | Â | 39 | 63.93 |
Community | Â | 9 | 14.75 | |
Others | Â | 13 | 21.31 | |
*Population area | Rural | Â | 37 | 60.66 |
Peri-urban | Â | 7 | 11.48 | |
Others | Â | 17 | 27.87 | |
**Mode of diagnosis | Microscope only | Â | 18 | 43.90 |
Real time PCR Assays + Reagent strip + Test for cSEA + microscopy | Â | 1 | 2.44 | |
Reagent strip only | Â | 1 | 2.44 | |
Microscopy and Reagent strip | Â | 21 | 51.22 | |
**Format of intensity | Arithmetic mean only | Â | 5 | 12.19 |
Geometric mean only | Â | 3 | 7.32 | |
WHO categories only | Â | 13 | 31.71 | |
Geometric+ WHO categories | Â | 1 | 2.44 | |
Not reported/Not specified | Â | 19 | 46.34 |