Shahrekord University of Medical Sciences Epidemiology and Health System Journal 2980-7891 6 1 2019 01 01 Mean Scores of Depression, Anxiety and Stress in Iranian University Students Based on DASS-21: A Systematic Review and Meta-analysis 42 48 10.15171/ijer.2019.08 EN Jahanshah Mohammadzadeh https://orcid.org/0000-0001-9177-1289 Shahram Mami https://orcid.org/0000-0003-1538-3246 Khadijeh Omidi https://orcid.org/0000-0003-1226-3150 Journal Article 10.15171/ijer.2019.08 2018 06 26 2019 01 05 Background and aims: Depression is the most common psychiatric disorder, and students are more predisposed to depression than other populations. This meta-analysis was conducted to estimate the mean depression score in Iranian students based on DASS-21. Methods: The search was carried out using keywords Depression, Student, DASS-21 and Iran in domestic databases, including SID, Medlib, IranMedex, Irandoc, and Magiran. Data were analyzed using a meta-analysis (random effects model). The heterogeneity of studies was studied using the I2 index. Data were analyzed using the Stata software version 11. DASS-21 had been used in all reviewed studies. Results: The sample size was 3229 people included in 17 studies. The mean depression score in Iranian students based on DASS-21 was 9.30 (95% CI: 12.57-6.03), 8.90 in female students (95% CI: 4.50-13.29) and 8.45 in male students (95% CI: 4.03-12.86). The mean scores of anxiety and stress in students were 8.58 (95% CI: 5.95-12.86) and 9.91 (95% CI: 11.28-8.54), respectively. Conclusion: The mean depression score is higher in female students than in male students, and the mean score of stress is slightly higher than those of anxiety and depression