In epidemiology, prevalence is the proportion of a particular population found to be affected by a medical condition at a specific time. It is derived by comparing the number of people found to have the condition with the total number of people studied and is usually expressed as a fraction, a percentage, or the number of cases per 10,000 or 100,000 people. Prevalence is most often used in questionnaire studies.

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Epidemiology of mental health comorbidity in patients with psoriasis: An analysis of trends from 1986 to 2019 shows the prevalence of depression, anxiety, and suicide in adults with psoriasis was 20%, 21%, and 0.77%.

Good News – New Study Finds That the Prevalence of Dementia Is Declining

What do evolutionary researchers believe about human psychology and behavior? - "We investigated the prevalence of beliefs in several key and contested aspects of human psychology and behavior in a broad sample of evolutionary-informed scholars (N = 581)."

Increased prevalence of metabolic imbalances in children during COVID-19 pandemic points to unsolved problem with early diagnosis of diabetes

Parental breakup and children's outcomes in the United States: Children of divorce were found to exhibit higher prevalence of several illnesses during adolescence and young adulthood than children of continuously married families.

Landscape and climate factors can predict prevalence of Lyme disease bacteria

New study explores the prevalence of heatwaves in East Asia

Recent study indicates high prevalence of recently defined non-Alzheimer's dementia

Estimating the prevalence of malicious extraterrestrial civilizations

Disparities in natural gas leak prevalence in U.S. urban areas

Walkable neighborhoods can reduce prevalence of obesity, diabetes

The prevalence of psychological consequences of COVID-19: A systematic review and meta-analysis of observational studies

Research shows that not only is the friend-first path to romantic love more prevalent than assumed (two-third prevalence, meta-analysis of N 1,897), it is also the path that the majority of people studied preferred (N 298).

Researchers reveal scale of prevalence of a condition that can cause type 2 diabetes and high blood pressure

Research (408 adults): Current employment in an industry with a high prevalence of sexual harassment reduces individuals’ likelihood of identifying scenarios as sexual harassment, as does prior work experience in highly sexually harassing industries.

Scientists Model “True Prevalence” of COVID-19 in the United States Throughout Pandemic

Scientists model 'true prevalence' of COVID-19 throughout pandemic

Scientists model 'true prevalence' of COVID-19 throughout pandemic

Study assesses the prevalence of mental illness during the pandemic among folks aged 50-80

Prevalence of COVID-19 among hospitalized infants varies with levels of community transmission