A 12-month longitudinal study of adolescents found that those who had experienced more negative events in their lives tended to have more severe depressive symptoms. This association was particularly pronounced regarding negative self-evaluation. Girls who experienced more negative life events reported greater increases in negative self-evaluation symptoms than boys. The paper is scientific report.
Depression is a mental health disorder characterized by persistent feelings of sadness, emptiness, or loss of interest in activities. It affects how a person feels, thinks, acts, and functions in daily life. Common symptoms include low mood, fatigue, difficulty concentrating, trouble sleeping, changes in appetite, and feelings of worthlessness or guilt. Some people may experience irritability, physical discomfort, slowed movements, or restlessness.
Depression is more severe and long-lasting than normal sadness caused by everyday disappointments. Difficult life events can contribute to depression, but it can also develop without an obvious external cause. Diagnosis generally requires that symptoms persist for at least two weeks and cause significant distress or impairment.
Study author Kate Ryan Kuhlman and colleagues investigated how stress contributes to the development of depression in adolescents by examining the association between negative life events and depressive symptoms. They noted that the risk of mental illness increases rapidly during adolescence. Previous research has found that only 4 percent of 12-year-olds suffer from depression, but this increases to almost 14 percent by age 15.
Negative life events are stressful or harmful experiences that can negatively impact a person’s emotional or psychological health. Adolescence includes events such as parental divorce, bullying, bereavement, family discord, academic failure, illness, abuse, and friendship and relationship problems.
Study participants were 97 adolescents enrolled in the Teen Resilience Project, a prospective, longitudinal study of behavioral factors linking early-life adversity and the onset of depression. The average age of participants was 14 years. About 46 percent of them were girls.
The study authors recruited these participants by sending a mass email to households with adolescents. These mass mailings included letters inviting parents to contact researchers for more information. Youth between the ages of 11 and 17 were eligible to participate.
Participants completed surveys at the start of the study and 4, 8, and 12 months after enrollment. They received $60 at the end of the first visit and an additional $15 for each subsequent follow-up. During the study, participants completed an assessment of negative life events using an 18-item checklist that asked about stressful events related to family, friends, and school.
At the beginning of the study, participants also completed an assessment of early life adversity. Their parents also completed similar assessments regarding adverse childhood experiences. The researchers used these tools to specifically oversample participants who had experienced early life adversity, a known risk factor for depression.
Study authors report that negative life events were common in their sample. Participants reported experiencing at least one negative life event in 71% of assessments. At each time point, 20 to 30 percent of participants clinically reported elevated depressive symptoms, and 13 percent were identified as having experienced a full-blown depressive episode at some point during the study period.
Over the course of the study, participants’ depressive symptoms tended to increase. This increase was specific to dysphoria and somatic complaints. Anhedonia and negative self-evaluation did not change significantly over time for the group as a whole. Dysphoria is a persistent state of sadness, irritability, anxiety, or emotional distress. Somatic complaints are physical symptoms such as headaches, fatigue, pain, trouble sleeping, and stomach discomfort.
Participants who experienced more negative events overall tended to have more severe depressive symptoms. This association was primarily driven by increased negative self-evaluation. Girls who experienced more negative events tended to report greater increases in negative self-evaluation than boys.
“The present data confirmed the well-established association between negative events and depressive symptoms, particularly negative self-evaluated symptoms, and women. The data support efforts to prevent depression in ELA-exposed youth (exposed to early life adversity), regardless of ongoing stress exposure, and gender-specific symptom targets that may reduce risk,” the study authors concluded.
This study contributes to the scientific understanding of the association between depressive symptoms and negative life events. However, it should be noted that this study was conducted with a small group of young adults in Southern California. Results for other cultural groups may not be identical. Furthermore, the observational design of this study does not allow direct causal conclusions to be drawn from the results.
The paper, titled “Sex, early life adversity, and negative self-evaluations shape the association between negative life events and adolescent depressive symptoms,” was authored by Kate Ryan Kuhlman, Elizabeth E. Antici, Haley Dveirin, Mai-Lan M. Tran, Natalie A. Hall, Paul Delacruz, and Julienne E. Bower.
