Table 8.

Top 25 frequent keywords in the period of 2004–2019.

Rank	Keywords	Year	Count	BC
1	Symptom	2004	7,335	0.6
2	Disorder	2004	7,071	0.25
3	Major depression	2004	5,883	0.28
4	Prevalence	2004	5,455	0.27
5	Meta-analysis	2004	3,212	0.08
6	Anxiety	2004	3,153	0.02
7	Risk	2004	3,040	0.01
8	Scale	2004	2,779	0.03
9	Association	2004	2,759	0
10	Quality of life	2004	2,756	0.04
11	Health	2004	2,753	0
12	Risk factor	2004	2,439	0.12
13	Stress	2004	2,056	0.11
14	Validity	2004	1,873	0.03
15	Validation	2004	1,819	0.02
16	Mental health	2004	1,817	0.04
17	Women	2004	1,802	0.03
18	Double blind	2004	1,760	0.18
19	Brain	2004	1,626	0.07
20	Population	2004	1,605	0.01
21	Disease	2004	1,500	0.02
22	Impact	2004	1,499	0.06
23	Primary care	2004	1,477	0.04
24	Mood	2004	1,459	0.01
25	Efficacy	2004	1,456	0.04

Count, number of times the article has been cited; BC, betweenness centrality.