Table 2 Quality assessment of the studies included in the quantitative analysis (N = 42)

1

Abdisa et al. [16]

0 star

*

*

*

*

*

*

satisfactory

2

Abebe et al. [40]

*

*

0 star

**

*

*

*

satisfactory

3

Adeniyi et al. [22]

*

0 star

0 star

**

*

**

*

satisfactory

4

Adeniyi et al. [17]

*

*

*

**

*

*

*

good

5

Aduloju et al. [19]

*

*

*

**

*

**

*

good

6

Aferu et al. [41]

*

*

0 star

0 star

0 star

*

0 star

unsatisfactory

7

Agboeze et al. [20]

*

*

*

*

0 star

*

0 star

satisfactory

8

Alcaide et al. [39]

*

0 star

0 star

**

*

**

*

satisfactory

9

Aregbesola et al. [65]

0 star

*

*

**

*

*

*

satisfactory

10

Asefa et al. [23]

*

*

*

*

*

*

*

satisfactory

11

Atanga et al. [42]

0 star

0 star

0 star

*

*

*

*

unsatisfactory

12

Brittain et al. [43]

0 star

0 star

0 star

0 star

*

*

0 star

unsatisfactory

13

Calder et al. [44]

*

*

0 star

**

*

*

*

satisfactory

14

Dada et al. [14]

*

0 star

0 star

0 star

*

*

*

unsatisfactory

15

Decker et al. [18]

*

0 star

0 star

0 star

0 star

*

*

unsatisfactory

16

Ebuy et al. [11]

*

*

*

*

*

*

*

satisfactory

17

Erlwanger et al. [45]

0 star

0 star

0 star

**

*

**

0 star

unsatisfactory

18

Fedlu et al. [25]

*

*

*

0 star

*

*

*

satisfactory

19

Fernandez-Luiz et al. [46]

*

0 star

0 star

0 star

Non applicable

*

0 star

unsatisfactory

20

Gebretsadik et al. [47]

*

*

*

0 star

*

*

*

Satisfactory

21

Haas et al. [48]

*

0 star

0 star

**

*

**

*

satisfactory

22

Itoua et al. [38]

*

0 star

0 star

0 star

0 star

*

0 star

unsatisfactory

23

Kadima et al. [26]

0 star

0 star

0 star

0 star

*

*

0 star

unsatisfactory

24

Larsen et al. [49]

*

*

0 star

0 star

*

*

*

satisfactory

25

Mukose et al. [24]

*

0 star

0 star

**

*

*

*

satisfactory

26

Mukosha et al. [50]

0 star

0 star

0 star

**

*

**

*

satisfactory

27

Nsubuga-Nyombi et al. [51]

*

0 star

0 star

0 star

*

*

0 star

unsatisfactory

28

Nutor et al

0 star

0 star

0 star

*

*

*

*

unsatisfactory

29

Omonaiye et al. [52]

*

*

0 star

0 star

*

*

*

satisfactory

30

Omonaiye et al. [53]

*

*

0 star

**

*

*

*

satisfactory

31

Onono et al. [54]

0 star

0 star

0 star

*

*

*

*

unsatisfactory

32

Phillips et al. [55]

0 star

0 star

0 star

*

*

*

*

unsatisfactory

33

Phillips et al. [56]

0 star

0 star

0 star

**

0 star

*

0 star

unsatisfactory

34

Ramlagan et al. [57]

*

0 star

0 star

**

*

*

*

satisfactory

35

Ramlagan et al. [58]

*

0 star

0 star

**

*

*

0 star

satisfactory

36

Schnack et al. [59]

0 star

0 star

0 star

*

0 star

**

*

unsatisfactory

37

Tarekegn et al. [60]

*

*

*

0 star

*

*

*

satisfactory

38

Tesfaye et al. [61]

*

*

*

*

*

*

*

satisfactory

39

Tsegaye et al. [62]

*

*

*

0 star

*

*

*

satisfactory

40

Wondimu et al [21]

0 star

*

*

0 star

*

*

*

satisfactory

41

Zacharius et al [63]

*

0 star

0 star

**

*

*

*

satisfactory

42

Zoungrana-Yameogo et al. [64]

*

0 star

0 star

*

*

*

*

satisfactory