Digital Media Use and Adolescents' Mental Health During the Covid-19 Pandemic: A Systematic Review and Meta-Analysis.

The Covid-19 physical distancing measures had a detrimental effect on adolescents' mental health. Adolescents worldwide alleviated the negative experiences of social distancing by spending more time on digital devices. Through a systematic literature search in eight academic databases (including Eric, Proquest Sociology, Communication & Mass Media Complete, Psychology and Behavioral Sciences Collection, PsycINFO, CINAHL, Pubmed, and Web of Science), the present systematic review and meta-analysis first summarized the existing evidence from 30 studies, published up to September 2021, on the link between mental health and digital media use in adolescents during Covid-19.

[The practical experience of quality control organization in the laboratory of Municipal consultative diagnostic center 1 of St. Petersburg].

The article specifies the functioning of quality control system in the laboratory of Municipal consultative diagnostic center i 1 of St. Petersburg. Initially, on the basis of interpretations of biological variations of every analyte, the requirements to analytical quality are developed.

[Present-day beta-lactame antibiotics in the treatment of urinary infections in pregnant women].

A multicenter trial of the prevalence and spectrum of urinary infection agents, their resistance to beta-lactame antibiotics in pregnant women in Russia was conducted in two stages. Stage 1 (2001) included microbiological studies, stage 2 (2005-2006)--pharmacoepidemiological ones. Most frequent uropathogens in the examinees were E.