. 2023 May 5;6:84. doi: 10.1038/s41746-023-00828-5

Table 1.

Characteristics of the included studies.

Feature	Number of studies (%)	References
Year of publication
2022	15 (27.8)	^{17,22,25,26,33,34,38,41,42,47,50,53,54,57,62}
2021	11 (20.4)	^{16,18–20,23,43,46,52,59,63,64}
2020	11 (20.4)	^{24,28,36,37,48,49,51,56,60,61,65}
2019	11 (20.4)	^{21,27,29,35,39,40,45,55,58,68,69}
2018	4 (7.4)	^30,31,44,67
2017	1 (1.9)	³²
2015	1 (1.9)	⁶⁶
Country of publication
USA	13 (24.1)	^{20,25,32,34,35,44,50,56,57,64,67,68}
Mexico	7 (13)	^{26,29,55,60–62,69}
South Korea	7 (13)	^{21–23,38,39,42,51}
Norway	6 (11.1)	^{18,27,30,31,36,40}
Japan	4 (7.4)	^28,53,58,65
United Kingdom	3 (5.6)	^24,33,41
China	2 (3.7)	^19,37
India	2 (3.7)	^45,48
Switzerland	2 (3.7)	^46,47
Others (Bangladesh, Finland, Italy, Netherlands, Poland, Singapore, Spain, Taiwan)	1 (each) (1.9)	^{16,43,49,52,54,59,63,66}
Type of publication
Journal article	40 (74.1)	^{16,17,19–26,29,33–37,39,41–45,47–51,54–57,60–66,68,69}
Conference Paper	12 (22.2)	^{18,27,28,30–32,38,52,53,58,59,67}
Thesis	2 (3.7)	^40,46
Number of participants
Mean (Standard Deviation)	315 (826)	^16–69
Range	8-4036	^16–69
Age of participants
Mean (Standard Deviation)	39.9 (13)	^{16,18,21–27,29–36,38–42,45,47,49,50,52–65,67,69}
Range	15.5-78	^{16,18,21–27,29–36,38–42,45,47,49,50,52–65,67,69}
Gender (Female %)
Mean (Standard Deviation)	60.2 (15.2)	^{16,18,21–27,29–42,44,47–50,52–65,67,69}
Range	2.4-100	^{16,18,21–27,29–42,44,47–50,52–65,67,69}
Health conditions¹
Depression	38 (70.4)	^{16–21,25–27,29–33,35,36,38–42,44,49–52,54–62,64,65,69}
Healthy	27 (50)	^{16,18,20,26,27,29–31,35,36,38,40,41,44,49,51,52,54,55,57–62,65,69}
Any health condition	13 (24.1)	^{22–24,28,34,37,46–48,53,63,67,68}
Bipolar	4 (7.4)	^21,42,43,66
Schizophrenia	1 (1.9)	⁶²
Mood swings	1 (1.9)	⁴⁵