Quality assessment of included articles
| Author (Year) | Strong | Moderate | Weak |
| Zraly21 (2011) | ✔ | ||
| Richters33 (2013) | ✔ | ||
| King39 (2014) | ✔ | ||
| King37 (2015) | ✔ | ||
| Mahr34 (2016) | ✔ | ||
| Ingabire36 (2017) | ✔ | ||
| Otake11 (2018) | ✔ | ||
| Kohli23 (2015) | ✔ | ||
| Koegler35 (2019) | ✔ | ||
| Morgan24 (2019) | ✔ | ||
| Ingabire22 (2020) | ✔ | ||
| Boothby25 (2006) | ✔ | ||
| Deacon38 (2009) | ✔ | ||
| Efraime and Errante26 (2012) | ✔ | ||
| Stark27 (2006) | ✔ | ||
| Hardgrove28 (2009) | ✔ | ||
| Wieling29 (2015) | ✔ | ||
| Reynolds30 (1990) | ✔ | ||
| Eiling31 (2014) | ✔ | ||
| Veale32 (2017) | ✔ |