Table 1.
Characteristics of the studies included in this meta-analysis
| Author | Year | Ethnicity | Cases |
Controls |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ε2/ε2 | ε3/ε3 | ε4/ε4 | ε2/ε3 | ε2/ε4 | ε3/ε4 | ε2/ε2 | ε3/ε3 | ε4/ε4 | ε2/ε3 | ε2/ε4 | ε3/ε4 | |||
| Shi et al (18) | 2001 | Han | 2 | 55 | 0 | 6 | 1 | 8 | 11 | 69 | 1 | 4 | 0 | 15 |
| Yuan et al (19) | 2006 | Han | 1 | 35 | 0 | 5 | 4 | 15 | 2 | 41 | 0 | 4 | 2 | 11 |
| Jiao et al (20) | 2007 | Han | 1 | 62 | 1 | 10 | 2 | 16 | 0 | 39 | 1 | 7 | 2 | 11 |
| You et al (16) | 2009 | Han | 3 | 76 | 1 | 22 | 11 | 31 | 2 | 55 | 0 | 32 | 6 | 15 |
| Sun et al (17) | 2010 | Han | 0 | 21 | 1 | 4 | 3 | 11 | 1 | 26 | 0 | 4 | 1 | 8 |
| Zhang et al (22) | 2012 | Han | 4 | 147 | 2 | 48 | 24 | 54 | 2 | 108 | 3 | 30 | 15 | 44 |
| Zong et al (15) | 2012 | Han | 2 | 74 | 4 | 16 | 4 | 20 | 2 | 54 | 1 | 12 | 2 | 9 |
| Wang et al (21) | 2012 | Han | 2 | 61 | 1 | 14 | 5 | 14 | 1 | 26 | 0 | 10 | 0 | 7 |
| Han et al (23) | 2015 | Han | 0 | 41 | 8 | 9 | 1 | 24 | 1 | 36 | 1 | 7 | 1 | 7 |
Cases: Patients diagnosed with depression; Controls: Healthy people.