Table 3.

summary of methodlogy assessment using Newcastle-Ottawa scale

Sudy	Selection (4 tars)	Comparability (2 stars)	Outcome (3 stars)	Total score (9 stars)
Adinew 2016 [20]	1 star	0 star	3 stars	4 stars
Teklemariam 2016 [18]	1 star	0 star	2star	3 stars
Bacha 2015 [17]	1 star	0 star	1 star	2 sstars
Desalew 2011 [15]	1 star	1 star	3 stars	5 stars
Adinew 2017 [14]	1 star	1 star	2 stars	4 star
Chala 2015 [21]	1 star	0 star	2 stars	3 stars
Mekonnen 2016 [22]	0 star	0 star	1 star	1 star
Melaku 2006 [36]	1 star	1 star	2 stars	4 stars
Jemal 2016 [19]	2 stars	1 star	2 stars	5 stars