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ImportanceThere is a growing body of high-quality cohort-based research that has examined changes in child and adolescent mental health during the COVID-19 pandemic vs before the pandemic. Some studies have found that child and adolescent depression and anxiety symptoms have increased, while others have found these symptoms to have remained stable or decreased.ObjectiveTo synthesize the available longitudinal cohort-based research evidence to estimate the direction and magnitude of changes in depression and anxiety symptoms in children and adolescents assessed before and during the pandemic.Data SourcesMedline, Embase, and PsycInfo were searched for studies published between January 1, 2020, and May 17, 2022.Study SelectionIncluded studies reported on depression and/or anxiety symptoms, had cohort data comparing prepandemic to pandemic estimates, included a sample of children and/or adolescents younger than 19 years, and were published in English in a peer-reviewed journal.Data Extraction and SynthesisIn total, 53 longitudinal cohort studies from 12 countries with 87 study estimates representing 40 807 children and adolescents were included.Main Outcomes and MeasuresStandardized mean changes (SMC) in depression and anxiety symptoms from before to during the pandemic.ResultsThe analysis included 40 807 children and adolescents represented in pre–COVID-19 studies and 33 682 represented in during–COVID-19 studies. There was good evidence of an increase in depression symptoms (SMC, 0.26; 95% CI, 0.19 to 0.33). Changes in depression symptoms were most conclusive for study estimates among female individuals (SMC, 0.32; 95% CI, 0.21 to 0.42), study estimates with mid to high income (SMC, 0.35; 95% CI, 0.07 to 0.63), and study estimates sourced from North America (SMC, 0.25; 95% CI, 0.15 to 0.36) and Europe (SMC, 0.35; 95% CI, 0.17 to 0.53). There was strong evidence that anxiety symptoms increased slightly during the pandemic (SMC, 0.10; 95% CI, 0.04 to 0.16), and there was some evidence of an increase in study estimates with mid to high income.ConclusionsThis systematic review and meta-analysis of longitudinal studies including children and adolescents found an increase in depression symptoms during the COVID-19 pandemic, particularly among female individuals and those from relatively higher-income backgrounds.

Loneliness is a significant health concern that may be influenced by dispositional features. Pathological narcissism may elevate loneliness through aversive interpersonal behaviors and negative social appraisals. The present study examined two dimensions of pathological narcissism, along with five-factor personality traits, in relation to loneliness among 120 young adults. Loneliness was also examined as a mediator between pathological narcissism and satisfaction with life. Narcissistic grandiosity and narcissistic vulnerability were both significantly associated with loneliness. Multiple regression analysis, including five-factor traits, revealed narcissistic vulnerability to be uniquely associated with loneliness, along with neuroticism. Mediation analysis also found an indirect effect of narcissistic vulnerability on reduced satisfaction with life, through loneliness as a mediator. These preliminary findings point to future research needs and potential clinical consideration of narcissistic vulnerability as a dispositional risk factor for loneliness.