Table 3.

Quality assessment of the included studies.

	Introduction		Methods					Results		Discussion
Study ID	Background/ rationale	Objectives	Settings	Participants	Variables	Data sources/ Measurement	Statistical methods	Descriptives data	Outcome data	Key results	Limitations	Total
1	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
2	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
3	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
4	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
5	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
6	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
7	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
8	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
9	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
10	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	X	10
11	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
12	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
13	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
14	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
15	✓	✓	✓	✓	✓	X	✓	✓	✓	✓	✓	10
16	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
17	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
18	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
19	✓	✓	✓	✓	✓	X	✓	✓	✓	✓	✓	10
20	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
21	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
22	✓	✓	✓	✓	✓	X	✓	✓	✓	✓	✓	10
23	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
24	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
25	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
26	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
27	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
28	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11
29	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	X	10
30	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓	11

✓ = present; X = absent.