Table 2.

Assessment of the quality of all studies included in the review based on Effective Public Health Practice Project: Quality assessment tool for quantitative studies

Study no.	Author (Year) [Reference]	Selection bias	Study design	Confounders	Blinding	Data collection methods	Withdrawals and drop-outs	Final rating
1	Kinung’hi et al. (2014) [27]	2	3	1	1	1	2	2
2	Mazigo et al. (2010) [28]	2	3	1	1	1	2	2
3	Righetti et al. (2012) [29]	3	3	1	1	1	2	2
4	Mboera et al. (2011) [30]	2	3	1	1	2	2	2
5	Abanyie et al. (2013) [31]	2	1	1	1	1	3	2
6	Achidi et al. (2008) [32]	2	3	2	1	2	2	2
7	Roussilhon et al. (2010) [33]	2	2	1	2	1	1	2
8	Bejon et al. (2008) [34]	2	1	1	2	1	1	2
9	Kung’u et al. (2009) [35]	2	3	2	1	1	2	2
10	Nkuo-Akenji et al. (2006) [36]	2	3	2	1	2	2	2
11	Kirwan et al. (2010) [37]	2	1	1	1	1	3	2

Coding: 1, strong; 2, moderate; 3, weak