The COVID-19 pandemic has had far-reaching effects on virtually every aspect of life, with adolescents being particularly impacted. This stage of life is already a period of significant emotional, social, and biological changes. When you add the unprecedented challenges of lockdowns, social distancing, and school closures, it’s no surprise that mental health issues among young people have surged. A new study from the French EpiCoV cohort delves into how these pandemic-related restrictions influenced adolescent depression. This study stands out because of its longitudinal design, which examines depression symptoms two years after restrictions were eased. Rather than focusing solely on the immediate effects of the lockdowns, it seeks to uncover the longer-lasting impacts of the pandemic on adolescent mental health.

The research included 1,946 adolescents between the ages of 15 and 18, who were assessed for depression symptoms using a well-established tool—the nine-item Patient Health Questionnaire (PHQ-9)—twice over a year following the lifting of restrictions. Several factors, including sociodemographic characteristics, lifestyle, housing conditions, and experiences during the lockdowns, were analysed.

What the study found was both expected and surprising. Among the adolescents studied, about 25% reported experiencing symptoms of depression. Unsurprisingly, girls were much more likely to report these symptoms than boys, which aligns with existing knowledge that adolescent girls are at a higher risk for depression. But beyond gender, the research also highlighted the role of lifestyle choices and pre-existing conditions. Adolescents who smoked, drank alcohol frequently, or had a history of mental health disorders were also significantly more likely to report depression.

One of the key findings of this study is that many of the factors associated with depression after the pandemic’s peak were already established risk factors before COVID-19. Being a girl, smoking, drinking alcohol, and having prior mental health issues all contributed to an increased risk of depression—both during the pandemic and afterwards. However, one environmental factor that emerged was the impact of living conditions. Adolescents who spent the lockdown in homes without access to outdoor space—like a garden, courtyard, or balcony—were more likely to experience depression. It’s easy to see why; being cooped up indoors for months without any form of physical escape or private outdoor area would undoubtedly contribute to feelings of isolation and stress.

Interestingly, despite the intense focus on lockdowns and restrictions, these factors didn’t seem to introduce new vulnerabilities. Instead, the pandemic exacerbated existing ones. Adolescents who were already more likely to struggle with mental health—whether due to gender, socioeconomic status, or lifestyle habits—were the ones most affected. In fact, the study revealed that the factors typically associated with depression outside of a pandemic context were the same ones that contributed to depression during and after the pandemic. This suggests that the pandemic didn’t create entirely new mental health crises among adolescents but rather worsened pre-existing conditions.

An important takeaway from this study is the need for proactive mental health interventions targeted at those who are most vulnerable. While the pandemic may be behind us, its impact on adolescent mental health is far from over. For those already struggling with mental health issues, the prolonged periods of isolation and stress caused by the pandemic may have lasting effects that need to be addressed with care and urgency. This means focusing on early identification of at-risk adolescents—particularly girls and those with a history of mental health issues—and offering them the support they need to build resilience. Schools, healthcare providers, and families should all support young people as they continue to navigate the challenges of the post-pandemic world.

The study also suggests that improving living conditions, especially for urban areas without outdoor space, should be a priority in future lockdowns or similar crises. Access to green spaces and outdoor areas could be crucial in mitigating the psychological effects of prolonged isolation.

Another critical element is addressing the impact of lifestyle factors like smoking and alcohol use on adolescent mental health. Both are known to be associated with depression, and the pandemic seems to have worsened these behaviours for some adolescents. Developing preventive strategies that discourage substance use and promote healthier coping mechanisms should be a key focus in future mental health initiatives.

In conclusion, this study offers a deeper understanding of how the COVID-19 pandemic and its related restrictions affected adolescent mental health. More importantly, it highlights the enduring impact of well-known risk factors. Rather than being an equalizer, the pandemic served to widen the gap between adolescents who were already vulnerable and those who were not. As we move forward, ensuring that mental health interventions are targeted and tailored to the needs of the most vulnerable adolescents is essential in helping them recover and thrive in a post-pandemic world.

Abstract of the study:

Purpose
The recent worldwide health pandemic and related social distancing and restrictions negatively impacted adolescents’ mental health, including depression, underscoring the need for comprehensive understanding beyond immediate impacts. We aimed to identify factors assessed during the first and second lockdowns that were associated with depression symptoms 2 years after restrictions easing.
Methods
This study included 1,946 adolescents, aged 15–18 years, involved in the French Epidémiologie et Conditions de Vie population-based cohort. Depression symptoms were assessed twice, with the nine-item Patient Health Questionnaire, at the beginning of restrictions easing and 1 year later. Logistic regressions were used to estimate associations among sociodemographic, socioeconomics, health, substance use, lockdown conditions, and pandemic-related factors, self-reported during the first and second lockdowns in France, and depression symptoms. Elastic-Net regression was used to study the joint effect of characteristics assessed during both lockdowns.
Results
A total of 472 (25.25%) adolescents reported depression symptoms in the restrictions easing period, 369 (78.18%) were girls and 103 (21.82%) were boys. Factors associated with a higher risk of reporting depression symptoms included being a girl, a smoker, frequently consuming alcohol, having spent lockdowns in a place without outdoor space, poor perceived health, and pre-existing mental disorders.
Discussion
Factors associated with depression symptoms after restrictions easing were well known and mostly not related to social distancing and restrictions, suggesting that already vulnerable youth were more likely to be impacted by the stressful pandemic context. Special caution is needed for these adolescents to limit pandemic’s impact on long-lasting mental health. These results also underscore the importance of early identification of at-risk adolescents and the development of interventions to enhance their resilience and support in case of future crises.