Table 2 Characteristics of studies included in the synthesis
Characteristics | Frequency (%) |
|---|---|
Publication year | |
 2005–2009 | 4 (13.8) |
 2010–2014 | 13 (44.8) |
 2015–2020 | 12 (41.4) |
Region | |
 Africa | 7 (24.1) |
 Asia | 17 (58.6) |
 America | 3 (10.3) |
 Europe | 2 (7) |
Article type/design | |
 Quantitative | 29 (100) |