The DMS-V (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition) is published by the American Psychiatric Association (APA).
Epidemiology refers to science that examines the causes, patterns, and effects of health and disease conditions within defined populations. Approximately 50% of people will experience some kind of mental disorder during their lifetime. The most common types of disorders that occur are mood disorders and anxiety disorders,
The most common types of disorders that occur are mood disorders (20.8%) and anxiety disorders (28.8%).
Below outlined table provides prevalence of DSM-IV disorders in adults in the United States:
| 1 Year (%) | Lifetime (%) | |
| Any anxiety disorder | 18.1 | 28.8 |
| Any mood disorder | 9.5 | 20.8 |
| Any substance abuse disorder | 3.8 | 14.6 |
| Any disorder | 26.2 | 46.4 |
Sources: Kessler et al. (2005a, 2005c).
Below table outlines the most common individual mental disorders in the United States:
| 1 Year (%) | Lifetime (%) | |
| Major Depressive Disorder | 6.7 | 16.6 |
| Alcohol abuse | 3.1 | 13.2 |
| Specific phobia | 8.7 | 12.5 |
| Social phobia | 6.8 | 12.1 |
| Conduct disorder | 1.0 | 9.5 |
Sources: Kessler et al. (2005a, 2005c).