Table 1.

Mental health studies and diagnosed mental illnesses

S/No.	Authors	Diagnosis	Mental health screening tool or scale used
1	Al-Maskari et al. (2011)	Depression	DASS 42
2	Boschman et al. (2013)	Depression Posttraumatic stress disorder (PTSD)	Whooley Depression Screen Impact of event scale
3	Bowen et al. (2018)	Psychological distress	Questions extracted from previous studies [7 items from Kessler K10 used in Schieman and Young (2013)]
4	Dong et al. (2015)	Depression	Center for Epidemiological Studies—Depression (CES—D)
5	Haynes and Love (2004)	Depression Anxiety	DASS 21
6	Hu et al. (2013)	PTSD Depression	HAM-D ICD-10 Classification Mental and Behavioral Disorders
7	Jacobsen et al. (2013)	Depression Anxiety Suicide	HSCL-25 MINI
8	Kamardeen and Sunindijo (2017)	Anxiety Depression	DASS 21
9	Langdon and Sawang (2018)	Depression Anxiety	DASS 21
10	Lim et al. (2018)	Depression Anxiety	CES-D STAI-T
11	Love et al. (2010)	Depression Anxiety	GHQ-12
12	Sutherland and Davidson (1993)	Anxiety Depression	CCEI
13	Sunindijo and Kamardeen (2017)	Depression Anxiety	DASS 21
14	Tsutsumi et al. (2001)	Depression	CES-D
15	Bowen et al. (2014)	Psychological strain	Questions extracted from previous studies
16	Lingard et al. (2007)	Mental distress	Questions extracted from GHQ-12