Table 1.

Quality assessment of included studies [12]. 1 = Present, 0 = missing.

	Abstractors Training	Selection Criteria	Variable Definition	Abstraction Forms	Performance Monitored	Blind to Hypothesis	IRR * Mentioned	IRR * Tested	MR Identified	Sampling Method	Missing Data Management	Institutional Review Board	Total Score
Aibar [13]	1	1	1	1	0	1	0	0	1	1	1	1	9
Aikpitanyi [14]	0	1	0	1	0	0	0	0	1	1	0	1	5
Benimana [15]	0	1	1	1	0	0	0	0	1	1	0	1	6
Carvalho [16]	0	1	1	1	0	1	1	0	0	0	0	1	6
David [17]	0	1	1	1	0	0	0	0	1	1	0	1	6
Florea [18]	No MRR, criteria inapplicable
Habte [19]	1	1	1	1	1	0	1	1	0	1	0	1	9
Hadad [20]	1	1	1	1	0	0	0	0	0	0	0	1	5
Huner [21]	No MRR, criteria inapplicable
Iwuh [22]	0	1	1	1	-	-	-	-	1	1	0	0	5
Jensen [23]	No MRR, criteria inapplicable
Johansen [24]	0	1	1	0	0	0	0	0	1	1	0	1	5
Johansen [25]	0	1	1	1	0	0	0	1	1	1	1	1	8
Kalisa [26]	1	1	1	0	0	0	0	0	1	1	0	0	5
Kasahun [27]	1	1	1	1	0	0	0	0	1	1	0	1	7
Kulkarni [28]	1	1	1	1	1	0	0	0	1	1	0	1	8
Mahmood [29]	0	1	0	1	0	0	0	0	1	1	0	0	4
Mawarti [30]	0	1	1	0	0	0	0	0	1	1	0	0	4
Mulongo [31]	No MRR, criteria inapplicable
Nassoro [32]	0	1	0	0	0	0	0	0	0	1	0	1	3
Neogi [33]	0	1	1	1	0	0	0	0	1	1	0	1	6
Saucedo [34]	0	1	1	1	0	0	0	0	1	1	1	1	7
Sayinzoga [35]	0	1	0	0	0	0	0	0	1	1	0	0	3
Sorensen [36]	0	1	1	1	1	0	1	0	1	1	0	1	8
Wasim [37]	No MRR, criteria inapplicable
Zewde [38]	1	1	1	1	0	0	1	0	1	1	0	1	8

* Inter observer reliability.