Author, year

Quality domain

Overall Score

Selection (Max score = 5)

Comparability (Max = 2)

Outcome (Max = 3)

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Achiko, 2019

★

★

★

★

★★

★

★

8

Asfawesen, 2018

★

★

-

★

★

★

★

6

Fekadu, 2006

★

★

-

★

★★

★★

★

8

Kebede, 1997

★

-

★

★

★★

★★

★

8

Ashenafi, 2001

★

★

★

★

★★

★★

★

9

Mulatu, 1999

★

★

★

★

★★

★

★

8

Desta, 2008

★

★

★

★

★★

★★

★

9

Alem, 2006

★

-

★

★

★★

★★

★

8

Nyundo, 2019

★

★

-

★

-

★

★

5

Nyundo, 2019

★

★

-

★

-

★

★

5

Asnake, 2016

★

-

★

★

★

★

★

6

Awas, 1999

★

-

★

★

★

★★

★

7

Kebede, 2005

★

★

★

★

★

★★

★

8

Wendemagegn, 2017

★

★

★

★

★

★

★

7

Kebede, 1999

★

★

★

★

★

★

★

7

Tafari, 1991

★

★

★

★

★

★

★

7

Keys:

A. Q1-Q7 represents questions used to assess the quality of included studies.

Selection

Q1. Representativeness of the sample: a) Truly representative of the average in the target population* (all subjects or random sampling); b) Somewhat representative of the average in the target population* (non-random sampling); c) Selected group of users. d) No description of the sampling strategy.

Q2. Sample size: a) Justified & satisfactory*, b) Not justified.

Q3. Non-respondents: a) Comparability between respondents and non-respondents characteristics is established, and the response rate is satisfactory*, b) The response rate is unsatisfactory, or the comparability between respondents and non-respondents is unsatisfactory, c) No description of the response rate or the characteristics of the responders and the non-responders.

Q4. Ascertainment of the exposure/risk factor: Confounding factors are controlled. a) The study controls for the most important factor (select one)* b) The study control for any additional factor*.

Comparability

Q5. The subjects in different outcome groups are comparable, based on the study design (e. g. case or cohort) or analysis. a) Validated measurement tool. **, b) Non-validated measurement tool, but the tool is available or described.* c) No description of the measurement tool.

Outcome

Q6. Assessment of outcome: a) Independent blind assessment ** b) Record linkage** c) Self report * d) No description.

Q7. Statistical test: a) is clearly described, appropriate, & measurement of association is presented, including confidence intervals & probability level (p value)* b) is not appropriate.