The following international electric databases will be searched:

Social Sciences Citation Index (via Web of Science)

ScienceDirect (https://www.sciencedirect.com/)

Taylor & Francis Online Database (https://www.tandfonline.com/)

JSTOR (https://www.jstor.org/)

PsychArticles (via ProQuest)

PsychInfo (via EBSCOhost)

OCLC FirstSearch (https://firstsearch.oclc.org/)

PubMed (https://pubmed.ncbi.nlm.nih.gov/)

EMBASE (https://www.embase.com/)

The Cochrane Library (https://www.cochranelibrary.com/)

The Campbell Library (https://www.campbellcollaboration.org/better-evidence.html)

3ie Systematic Review Database (https://www.3ieimpact.org/evidence-hub/publications/systematic-reviews)

Epistemonikos (https://www.epistemonikos.org/)

CNKI (https://www.cnki.net/)

In addition, the pre‐print repository MedRxiv (https://www.medrxiv.org/) will also be searched
Below, the search strategy for PubMed is provided:
Depressive symptom keywords

“Depressive Disorder”[Mesh] OR “Long‐Term Synaptic Depression”[Mesh] OR “Depression, Postpartum”[Mesh] OR “Depressive Disorder, Treatment‐Resistant” [Mesh] OR “Bipolar Disorder”[Mesh] OR “Dysthymic Disorder”[Mesh] OR “Seasonal Affective Disorder”[Mesh] OR “Depressive Disorder, Major”[Mesh] OR “Adjustment Disorders”[Mesh] OR “Affective Disorders, Psychotic”[Mesh] OR “Depression”[Mesh]

OR

(((depress* [Title/Abstract] OR distress [Title/Abstract]) OR (“Psychological Distress”[Mesh])) OR (“Depressive Disorder”[Mesh] OR “Long‐Term Synaptic Depression”[Mesh] OR “Depression, Postpartum”[Mesh] OR “Depressive Disorder, Treatment‐Resistant”[Mesh] OR “Bipolar Disorder”[Mesh] OR “Dysthymic Disorder”[Mesh] OR “Seasonal Affective Disorder”[Mesh] OR “Depressive Disorder, Major”[Mesh] OR “Adjustment Disorders”[Mesh] OR “Affective Disorders, Psychotic”[Mesh] OR “Depression”[Mesh])

Population keywords

(“Adult” [Mesh] or (adult*[Title/Abstract]) or (old [Title/Abstract])

NOT

(“Child “ [Mesh] or (Child*[Title/Abstract]))

NOT

(“Adolescent “ [Mesh] or Adolescen* [Title/Abstract] OR Teen*[Title/Abstract] OR Youth [Title/Abstract] OR underage [Title/Abstract])

Study design keywords

((“systematic review”[Title] OR “meta‐analysis” [Title] OR meta [Title] OR systematic [Title]) OR (“Meta‐Analysis” [Publication Type] OR “Meta‐Analysis as Topic”[Mesh])) OR (“Systematic Review” [Publication Type] OR “Systematic Reviews as Topic”[Mesh])

The following Chinese electric databases will be searched:

Chinese National Knowledge Infrastructure, CNKI (https://new.wanfangdata.com.cn/index.html)

Database for Chinese Technical Periodicals, VIP (http://www.tydata.com/)

Wanfang (https://new.wanfangdata.com.cn/index.html)

Below, the search strategy for CNKI is provided:
Population keywords:

篇关摘= 成人 + 成年人 + 大学生

Not

篇关摘= 儿童 + 青少年 + 未成年 + 少年

Depressive symptom keywords:

篇关摘= 抑郁 + 心理

Study design keywords:

篇关摘= 系统评价 + 元分析 + 荟萃分析 + meta分析

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