Table 2.
The general descriptions of the studies and studied populations within studies included to a systematic review.
| Ref. | Authors, Year | Country/Detailed Location | Studied Population | Period of the Study |
|---|---|---|---|---|
| [29] | Khoraminya et al., 2013 | Iran/Tehran | Patients with major depressive disorder from the Roozbeh Psychiatry Hospital, Tehran University of Medical Sciences, Tehran | From November 2010 to December 2011 |
| [30] | Marsh et al., 2017 | United States of America (USA)/Massachusetts | Patients with bipolar depression and vitamin D deficiency from central Massachusetts, USA | From June 2013 to April 2015 |
| [31] | Hansen et al., 2019 | Denmark/Esbjerg, Odense and Svendborg | Patients with depressive episode from the mood disorder clinic in the Region of Southern Denmark | From November 2010 to June 2014 |
| [32] | Alavi et al., 2019 | Iran | Older patients with moderate to severe depression from three psychiatric clinics | From March 2016 to February 2017 |
| [33] | Kaviani et al., 2020 | Iran/Tehran | Patients with mild to moderate depression referred to the outpatient clinics of Baharloo Hospital | From May 2018 to June 2019 |
| [34] | Amini te al., 2020 | Iran/Ahvaz | Female patients with postpartum depression from the outpatient clinic of Ahvaz Jundishapur University of Medical Sciences | From June to November 2017 |
| [35] | Alghamdi et al., 2020 | Saudi Arabia/Jeddah | Patients with major depressive disorder from the psychiatry clinic at the King Abdulaziz University Hospital | Not specified (3 months) |
| [36] | Zhu et al., 2020 | China/Anhui | Patients with depression, anxiety and low 25(OH)D levels recruited through advertisements from Anhui Mental Health Center | From November 2015 to September 2019 |