Related Experiment Video
Updated: Aug 28, 2025

A New Method for Inducing a Depression-Like Behavior in Rats
Published on: February 22, 2018
Prevalence and Impact of Diagnosed and Undiagnosed Depression in the United States
Asim Handy1, Rohan Mangal2, Thor S Stead3
1Biology, Detroit Country Day School, Detroit, USA.
Background:
The objectives of this study were: 1) estimate the impact and severity of both diagnosed and undiagnosed depression in the general US population 2) explore the demographics of depression based on its common symptoms 3) interpret Patient Health Questionnaire-9 (PHQ-9) scores to improve accuracy in identifying individuals with depression.
Methods:
A random sample of 200 individuals was selected from a general US adult population to complete the Patient Health Questionnaire-9 (PHQ-9).
Results:
Only 39.4% of respondents indicated that they had a formal diagnosis of depression. In contrast, 53% of participants have considered seeking help from a mental health professional. More importantly, 31.45% of respondents without a formal diagnosis had a PHQ-9 score of over 10 (moderate to severe depression).
Conclusions:
The results indicate that undiagnosed depression exists in the US population and suggest that access to mental health services needs to expand across the nation.
More Related Videos
06:55An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents
Published on: December 2, 2015
04:33Author Spotlight: Unveiling the Connection Between Sleep Disorders and Cognitive Symptoms in Depression
Published on: April 26, 2024
Related Concept Videos
Depression: Overview
Depressive Disorders: MDD and Dysthymia
Diagnostic and Statistical Manual of Mental Disorders (DSM)
Depressive Disorders: Etiology
Biological Factors in Depression
Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
Stress and Mental Health
Individuals with depression often experience challenges in both their personal and professional...
Long-term Depression
Calcium Ion Concentration Mechanism
If over...