Table 2 Quality assessment of studies
From: Association between mitochondrial DNA levels and depression: a systematic review and meta-analysis
Study source | Selection | Comparability Comparability of cohorts on the basis of the design or analysis | Exposure | Total score | |||||
|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the non- exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow- up of cohorts | |||
Karen M Ryan [17] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Emi Ampo [18] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Vanessa F Gonçalves [19] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Johan Fernström [20] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Jae Kyung Chung [21] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Kerstin Kuffner [22] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Daniel Lindqvist [23] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Cheng Chen Chang [24] | 1 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 7 |
Ying He [25] | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 |
Kato T [26] | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 5 |