The research findings are from the CDC National Center for Health Statistics (NCHS). Data was collected during the National Health Interview Survey 2021, involving more than 29,400 participants. The rate of individuals living alone in the United States at that time reached 16%, experiencing a significant increase in the last five decades. According to the report, the number of individuals living alone in 2022 reached 37.9 million people, an increase of 4.8 million from 2012.

The study conducted by CDC's National Center for Health Statistics (NCHS) shows that 6.4% of adults who live alone experience symptoms of depression. Meanwhile, only 4.1% of those who live with others report the same thing. This difference is observed in all groups, including gender, age, income level, and ethnicity.

In several contexts, economic factors can be the cause of increased symptoms of depression, especially among individuals who live alone. Adults with low income are more vulnerable to experiencing emotional stress. There are various reasons why some people choose to live alone, such as choice, separation in relationships, or the loss of a partner.

The question in the study also concerns how often individuals receive the necessary social and emotional support. From the research results, it is revealed that adults who live alone and state that they rarely receive social and emotional support tend to experience a depression level almost twice as high compared to individuals in similar situations who live with others.

The World Health Organization (WHO) asserts that loneliness is a "global issue in society today". Loneliness and social isolation not only have the potential to cause depression but also increase the risk of various other health problems. The National Center for Health Statistics (NCHS) CDC states that living alone can increase the risk of dementia by 50%, the risk of heart disease by 29%, and the risk of stroke by 32%.