Depression prevalence in 30 countries between 1994 and 2014 was 12.9%, 7.2%, and 10.8%, with higher rates in women, countries with medium human development index, and studies published between 2004 and 2014.

Prevalence of Depression in the Community from 30 Countries between 1994 and 2014

Depression and depressive symptoms are prevalent in 27.0% of outpatients, with higher rates in developing countries and developing countries, and a slight decrease from 1996 to 2010.

Prevalence of depression and depressive symptoms among outpatients: a systematic review and meta-analysis

University students experience significantly higher rates of depression compared to the general population, with a weighted mean prevalence of 30.6%.

A systematic review of studies of depression prevalence in university students.

34% of adolescents globally aged 10-19 years are at risk of developing clinical depression, with females and those from Middle East, Africa, and Asia at the highest risk.

Global prevalence of depression and elevated depressive symptoms among adolescents: A systematic review and meta-analysis.

Depression prevalence has been increasing over time, with no evidence of study design differences or publication bias explaining this trend.

Global trends in the prevalence and incidence of depression:a systematic review and meta-analysis.

Depression prevalence among elderly population in India is 34.4%, with higher rates in females, rural populations, and eastern regions.

Prevalence of depression among the elderly (60 years and above) population in India, 1997–2016: a systematic review and meta-analysis

Depression is common among Iranian university students, with no preponderance between males and females, and higher rates in single students than married ones.

Prevalence of Depression among University Students: A Systematic Review and Meta-Analysis Study

Depression symptoms in postgraduate students have remained relatively constant from 1980 to 2020, highlighting the need for mental health interventions among educators and students.

Prevalence and changes in depressive symptoms among postgraduate students: A systematic review and meta-analysis from 1980 to 2020.

Depression is more prevalent in women due to biological sex differences, with a greater risk in young women and those aged 14-25 years, but this ratio decreases with age.

Why is depression more prevalent in women?

Depression prevalence in the USA increased significantly from 2005 to 2015, with a more rapid increase in youth compared to older age groups.

Trends in depression prevalence in the USA from 2005 to 2015: widening disparities in vulnerable groups

Depression prevalence among adults aged 20 and over in the United States was estimated at 8.9% in 2013, with non-Hispanic Asian individuals experiencing the highest rates.

Prevalence of Depression Among Adults Aged 20 and Over: United States, 2013-2016.

Depression is a significant and growing global health issue, causing increased mortality, disability, and decreased workplace productivity, resulting in a $36.6 billion annual loss in the US.

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Depression rates during pregnancy are substantial, particularly during the second and third trimesters.

Prevalence of Depression During Pregnancy: Systematic Review

Depression is a significant public health issue with an increasing prevalence, particularly among younger people, but there are challenges in estimating accurate prevalence numbers.

The Prevalence of Depression

A high prevalence of depression (34.0%) is found among nursing students, with variations observed among age, geographical region, and ethnicity.

Prevalence of depression among nursing students: A systematic review and meta-analysis.

Depression prevalence in patients with mild cognitive impairment is high, with greater burden prevalent in clinic-based samples.

Prevalence of Depression in Patients With Mild Cognitive Impairment: A Systematic Review and Meta-analysis

Depression and anxiety are less common in cancer patients than previously thought, but some combination of mood disorders occurs in 30-40% of patients in hospital settings, with no significant difference between palliative-care and non-palliative-care settings.

Prevalence of depression, anxiety, and adjustment disorder in oncological, haematological, and palliative-care settings: a meta-analysis of 94 interview-based studies.

Perinatal depression is more prevalent in women from low- and middle-income countries compared to high-income countries.

A systematic review and meta-regression of the prevalence and incidence of perinatal depression.

Depression prevalence in people living with HIV in sub-Saharan Africa ranges from 9% to 32%, with low socio-economic conditions, female sex, and immunosuppression as potential associated factors.

Prevalence and factors associated with depression in people living with HIV in sub-Saharan Africa: A systematic review and meta-analysis

Substance use disorders (SUDs) are highly prevalent in individuals with major depressive disorder, with alcohol use disorder being the most common comorbidity.

Prevalence of comorbid substance use in major depressive disorder in community and clinical settings, 1990-2019: Systematic review and meta-analysis.

Some studies suggest depression prevalence ranges from 7.2% to 34.4% depending on the population and region, while other studies indicate higher rates in specific groups such as university students and adolescents.