https://www.selleckchem.com/products/Adrucil(Fluorouracil).html bly accurate mean values of sleep and HR estimates in shift workers under naturalistic conditions. Nevertheless, the generally wide limits of agreement hamper the precision of quantifying individual sleep episodes. The value of this consumer-grade multisensor wearable in terms of tackling clinical and research questions could be enhanced with open-source algorithms, raw data access, and the ability to blind participants to their own sleep data. We conclude that by following careful data processing processes, the Fitbit Charge 2 can provide reasonably accurate mean values of sleep and HR estimates in shift workers under naturalistic conditions. Nevertheless, the generally wide limits of agreement hamper the precision of quantifying individual sleep episodes. The value of this consumer-grade multisensor wearable in terms of tackling clinical and research questions could be enhanced with open-source algorithms, raw data access, and the ability to blind participants to their own sleep data. The coronavirus pandemic (COVID-19) has resulted in significant changes to adolescents' daily lives and, potentially, to their mental health. The pandemic has also disproportionately affected historically marginalized and at-risk communities, including people of color, socioeconomically disadvantaged people, people identifying as female, and youth. This study aimed to understand differences in depression and anxiety among two groups of US adolescents before and during the COVID-19 pandemic, and to examine demographic and daily activity variables associated with depression and anxiety. Online surveys were distributed in 2019 and 2020. Analyses of covariance compared depression and anxiety between pre-pandemic and pandemic groups. Demographic and lifestyle variables were included as covariates. Within the pandemic group, 94% of adolescents reported being out of school due to the pandemic, and another 86% and 57% were preve