@misc{ReissBehnErhartetal., author = {Reiß, Franziska and Behn, Steven and Erhart, Michael and Strelow, Lisa and Kaman, Anne and Ottov{\´a}-Jordan, Veronika and Bilz, Ludwig and Moor, Irene and Ravens-Sieberer, Ulrike}, title = {Subjective health and psychosomatic complaints of children and adolescents in Germany: Results of the HBSC study 2009/10 - 2022}, series = {Journal of Health Monitoring}, volume = {9}, journal = {Journal of Health Monitoring}, number = {1}, issn = {2511-2708}, doi = {10.25646/11868}, pages = {7 -- 22}, abstract = {Background: Subjective health and well-being are important health indicators in childhood and adolescence. This article shows current results and trends over time between 2009/10 and 2022. Methods: The Health Behaviour in School-aged Children (HBSC) study examined subjective health, life satisfaction and psychosomatic complaints of N = 21,788 students aged 11 to 15 years in the school years 2009/10, 2013/14, 2017/18 and in the calendar year 2022. Multivariate regression analyses show the associations between sociodemographic characteristics and well-being in 2022, as well as trends since 2009/10. Results: The majority of children and adolescents indicate a good subjective health and high life satisfaction. About half of the girls and one third of the boys report multiple psychosomatic health complaints, with a clear increase over time. Older adolescents, girls and gender diverse adolescents are at an increased risk of poor well-being. Subjective health and life satisfaction varied between 2009/10 and 2022, with a significant deterioration between 2017/18 and 2022. Conclusions: The high proportion of children and adolescents with psychosomatic complaints, as well as the observed gender and age differences, underline the need for target group-specific prevention, health promotion and continuous health monitoring.}, language = {en} } @misc{MoorHerkeMarkertetal., author = {Moor, Irene and Herke, Max and Markert, Jenny and B{\"o}hm, Marie and Reiß, Franziska and Bilz, Ludwig and Sudeck, Gorden and Winter, Kristina}, title = {Trends in health inequalities in childhood and adolescence in Germany: Results of the HBSC study 2009/10 - 2022}, series = {Journal of Health Monitoring}, volume = {9}, journal = {Journal of Health Monitoring}, number = {1}, issn = {2511-2708}, doi = {10.25646/11876}, pages = {79 -- 98}, abstract = {Background: Many studies have identified health inequalities in childhood and adolescence. However, it is unclear how these have developed in recent years, particularly since the COVID-19 pandemic. Methods: Analyses are based on the German data from the international Health Behaviour in School-aged Children (HBSC) study from 2009/10 (n = 5,005), 2013/14 (n = 5,961), 2017/18 (n = 4,347), and 2022 (n = 6,475). A total of 21,788 students aged approximately between 11 and 15 years were included. Socioeconomic status (SES) was assessed using the Family Affluence Scale (FAS). Several health indicators were analysed stratified by gender using bivariate and multivariate analysis methods. Results: In 2022, there are clear socioeconomic inequalities in life satisfaction, self-rated health, fruit and vegetable consumption, and physical activity. These inequalities remained largely constant or increased between 2009/10 and 2022. Between 2017/18 and 2022, no significant changes in inequalities were found. Conclusions: Health inequalities are persistent and reduce the chances of growing up healthy. There is no evidence that inequalities in the analysed outcomes have changed during the pandemic period (between 2017/18 and 2022). Rather, the changes in the health indicators seem to affect all adolescents in a similar way.}, language = {en} } @misc{WinterMoorMarkertetal., author = {Winter, Kristina and Moor, Irene and Markert, Jenny and Bilz, Ludwig and Bucksch, Jens and Dadaczynski, Kevin and Fischer, Saskia M. and Helmchen, Ronja M. and Kaman, Anne and M{\"o}ckel, Juliane and Rathmann, Katharina and Ravens-Sieberer, Ulrike and Reiß, Franziska and Schierl, Theresa and Sch{\"u}tz, Raphael and Sendatzki, Saskia and St{\"u}rmer, Elisabeth and Sudeck, Gorden and Richter, Matthias}, title = {Concept and methodology of the Health Behaviour in School-aged Children (HBSC) study - Insights into the current 2022 survey and trends in Germany}, series = {Journal of Health Monitoring}, volume = {9}, journal = {Journal of Health Monitoring}, number = {1}, issn = {2511-2708}, doi = {10.25646/11878}, pages = {99 -- 117}, abstract = {Background: Health Behaviour in School-aged Children (HBSC) is one of the largest international studies on child and adolescent health and cooperates with the World Health Organization (WHO). In Germany, adolescents aged 11, 13 and 15 are surveyed every four years about their health, health behaviour and social conditions. This article describes the HBSC study and in particular the methodology of the current 2022 survey and prior surveys conducted between 2009/10 and 2017/18. Method: 174 schools with a total of 6,475 students participated in the 2022 survey. The survey was conducted using questionnaires and covered a wide range of topics (including mental health, physical activity, bullying experiences, social determinants of health and experiences related to COVID-19). The 2022 survey was complemented by a school principal survey (N = 160). In addition to the current sample, the samples of the three previous surveys with representative data for Germany are presented: 2009/10 (N = 5,005), 2013/14 (N = 5,961) and 2017/18 (N = 4,347). Discussion: The health of children and adolescents is of great public health importance. The HBSC study makes a substantial contribution by providing internationally comparable results, analysing trends, and providing stakeholders with comprehensive and representative health monitoring data.}, language = {en} } @misc{WinterMoorMarkertetal., author = {Winter, Kristina and Moor, Irene and Markert, Jenny and Bilz, Ludwig and Bucksch, Jens and Dadaczynski, Kevin and Fischer, Saskia M. and Helmchen, Ronja M. and Kaman, Anne and M{\"o}ckel, Juliane and Rathmann, Katharina and Ravens-Sieberer, Ulrike and Reiß, Franziska and Schierl, Theresa and Sch{\"u}tz, Raphael and Sendatzki, Saskia and St{\"u}rmer, Elisabeth and Sudeck, Gorden and Richter, Matthias}, title = {Konzept und Methodik der Studie Health Behaviour in Schoolaged Children (HBSC) - Einblicke in den aktuellen Survey 2022 und die Entwicklung in Deutschland}, series = {Journal of Health Monitoring}, volume = {9}, journal = {Journal of Health Monitoring}, number = {1}, issn = {2511-2708}, doi = {10.25646/11877}, pages = {108 -- 127}, abstract = {Hintergrund: „Health Behaviour in School-aged Children (HBSC)" ist eine der gr{\"o}ßten internationalen Kinder- und Jugendgesundheitsstudien und kooperiert mit der Weltgesundheitsorganisation (WHO). In Deutschland werden im vierj{\"a}hrigen Turnus jeweils Heranwachsende im Alter von 11, 13 und 15 Jahren zur Gesundheit, zum Gesundheitsverhalten und zu sozialen Rahmenbedingungen befragt. Der Beitrag widmet sich der Beschreibung der HBSC-Studie und speziell der Methodik des aktuellen Surveys 2022 sowie der vorherigen Erhebungen von 2009/10 bis 2017/18. Methode: Am Survey 2022 beteiligten sich 174 Schulen mit insgesamt 6.475 Sch{\"u}lerinnen und Sch{\"u}lern. Die Erhebung erfolgte mittels Fragebogen und erfasst ein breites Themenspektrum (u. a. mentale Gesundheit, Bewegungsverhalten, Mobbingerfahrungen, soziale Determinanten der Gesundheit sowie Erfahrungen im Zusammenhang mit COVID-19). Erg{\"a}nzt wurde die Erhebung 2022 um eine Schulleitungsbefragung (N = 160). Neben der aktuellen Stichprobe werden auch die Stichproben der vorangegangenen drei Surveys mit repr{\"a}sentativen Angaben f{\"u}r Deutschland vorgestellt: 2009/10 (N = 5.005), 2013/14 (N = 5.961) und 2017/18 (N = 4.347). Diskussion: Die Kinder- und Jugendgesundheit hat eine hohe Public-Health-Relevanz. Dazu leistet die HBSC-Studie einen elementaren Beitrag, denn sie liefert international vergleichbare Ergebnisse, erm{\"o}glicht die Analyse von Trendentwicklungen und stellt umfangreiche, repr{\"a}sentative Daten zum Gesundheitsmonitoring f{\"u}r Stakeholder bereit.}, language = {de} } @misc{ReissBehnErhartetal., author = {Reiß, Franziska and Behn, Steven and Erhart, Michael and Strelow, Lisa and Kaman, Anne and Ottov{\´a}-Jordan, Veronika and Bilz, Ludwig and Moor, Irene and Ravens-Sieberer, Ulrike}, title = {Subjektive Gesundheit und psychosomatische Beschwerden von Kindern und Jugendlichen in Deutschland: Ergebnisse der HBSC-Studie 2009/10 - 2022}, series = {Journal of Health Monitoring}, volume = {9}, journal = {Journal of Health Monitoring}, number = {1}, issn = {2511-2708}, doi = {10.25646/11867}, pages = {7 -- 24}, abstract = {Hintergrund: Die subjektive Gesundheit und das Wohlbefinden stellen wichtige Gesundheitsindikatoren im Kindes- und Jugendalter dar. Der vorliegende Beitrag zeigt aktuelle Ergebnisse sowie zeitliche Trends zwischen 2009/10 und 2022. Methode: Die „Health Behaviour in School-aged Children (HBSC)"-Studie erfasste in den Schuljahren 2009/10, 2013/14, 2017/18 und im Kalenderjahr 2022 bei N = 21.788 Sch{\"u}lerinnen und Sch{\"u}lern im Alter von 11 bis 15 Jahren deren subjektive Gesundheit, Lebenszufriedenheit und psychosomatische Beschwerden. Multivariate Regressionsanalysen zeigen die Zusammenh{\"a}nge zwischen soziodemografischen Merkmalen und dem Wohlbefinden f{\"u}r 2022 sowie Trendverl{\"a}ufe seit 2009/10. Ergebnisse: Der Großteil der Kinder und Jugendlichen berichtet eine gute subjektive Gesundheit und eine hohe Lebenszufriedenheit. Etwa die H{\"a}lfte der M{\"a}dchen und ein Drittel der Jungen berichten multiple psychosomatische Gesundheitsbeschwerden, mit einem deutlichen Anstieg im zeitlichen Verlauf. {\"A}ltere Jugendliche, M{\"a}dchen und Genderdiverse haben ein erh{\"o}htes Risiko f{\"u}r ein geringes Wohlbefinden. Zwischen 2009/10 und 2022 variierten die subjektive Gesundheit und die Lebenszufriedenheit mit einer deutlichen Verschlechterung von 2017/18 zu 2022. Schlussfolgerungen: Der hohe Anteil von Kindern und Jugendlichen mit psychosomatischen Beschwerden sowie die aufgezeigten Geschlechts- und Altersdiskrepanzen verdeutlichen den Bedarf an zielgruppenspezifischer Pr{\"a}vention, Gesundheitsf{\"o}rderung und einem kontinuierlichen Gesundheitsmonitoring.}, language = {de} } @misc{MoorHerkeMarkertetal., author = {Moor, Irene and Herke, Max and Markert, Jenny and B{\"o}hm, Marie and Reiß, Franziska and Bilz, Ludwig and Sudeck, Gorden and Winter, Kristina}, title = {Die zeitliche Entwicklung gesundheitlicher Ungleichheit im Kindes- und Jugendalter in Deutschland: Ergebnisse der HBSC-Studie 2009/10 - 2022}, series = {Journal of Health Monitoring}, volume = {9}, journal = {Journal of Health Monitoring}, number = {1}, issn = {2511-2708}, doi = {10.25646/11875}, pages = {86 -- 107}, abstract = {Hintergrund: Viele Studien berichten von gesundheitlichen Ungleichheiten im Kindes- und Jugendalter. Unklar ist, wie sich diese in den letzten Jahren, insbesondere vor dem Hintergrund der COVID-19-Pandemie, entwickelt haben. Methode: Die Analysen basieren auf den deutschen Daten der internationalen HBSC-Studie (Health Behaviour in Schoolaged Children) von 2009/10 (n = 5.005), 2013/14 (n = 5.961), 2017/18 (n = 4.347) und 2022 (n = 6.475). Insgesamt wurden 21.788 Sch{\"u}lerinnen und Sch{\"u}ler im Alter von ca. 11 bis 15 Jahren ber{\"u}cksichtigt. Der sozio{\"o}konomische Status (SES) wurde mithilfe der Family Affluence Scale (FAS) erhoben. Verschiedene Gesundheitsindikatoren wurden mittels bi- und multivariaten Analysemethoden stratifiziert nach Geschlecht ausgewertet. Ergebnisse: 2022 zeigen sich deutliche sozio{\"o}konomische Ungleichheiten in der Lebenszufriedenheit, der subjektiven Gesundheit, im Obst- und Gem{\"u}sekonsum sowie im Bewegungsverhalten. Diese Ungleichheiten sind im Zeitverlauf von 2009/10 bis 2022 {\"u}berwiegend konstant geblieben oder haben sich vergr{\"o}ßert. Zwischen 2017/18 und 2022 sind keine signifikanten {\"A}nderungen bez{\"u}glich der betrachteten Ungleichheiten zu erkennen. Schlussfolgerungen: Gesundheitliche Ungleichheiten zeigen sich kontinuierlich und reduzieren die Chancen auf ein gesundes Aufwachsen. Es gibt keine Hinweise darauf, dass sich die Ungleichheiten w{\"a}hrend des Pandemie-Zeitraums (zwischen 2017/18 und 2022) ver{\"a}ndert haben. Die Ver{\"a}nderungen in den betrachteten Gesundheitsindikatoren betreffen vielmehr alle Heranwachsende in {\"a}hnlicher Weise.}, language = {de} } @misc{DadaczynskiMoorBuckschetal., author = {Dadaczynski, Kevin and Moor, Irene and Bucksch, Jens and Winter, Kristina and Schierl, Theresa and Bilz, Ludwig and Reiß, Franziska}, title = {Gesundheitsverhalten und Gesundheit von Kindern und Jugendlichen in Deutschland. Ergebnisse der Health Behaviour in School-aged Children (HBSC) Studie 2022}, series = {Gesundheit - gemeinsam. Kooperationstagung der Deutschen Gesellschaft f{\"u}r Medizinische Informatik, Biometrie und Epidemiologie (GMDS), Deutschen Gesellschaft f{\"u}r Sozialmedizin und Pr{\"a}vention (DGSMP), Deutschen Gesellschaft f{\"u}r Epidemiologie (DGEpi), Deutschen Gesellschaft f{\"u}r Medizinische Soziologie (DGMS) und der Deutschen Gesellschaft f{\"u}r Public Health (DGPH). Dresden}, journal = {Gesundheit - gemeinsam. Kooperationstagung der Deutschen Gesellschaft f{\"u}r Medizinische Informatik, Biometrie und Epidemiologie (GMDS), Deutschen Gesellschaft f{\"u}r Sozialmedizin und Pr{\"a}vention (DGSMP), Deutschen Gesellschaft f{\"u}r Epidemiologie (DGEpi), Deutschen Gesellschaft f{\"u}r Medizinische Soziologie (DGMS) und der Deutschen Gesellschaft f{\"u}r Public Health (DGPH). Dresden}, publisher = {German Medical Science GMS Publishing House}, address = {D{\"u}sseldorf}, doi = {10.3205/24gmds888}, language = {de} } @misc{ReissOttovaJordanBilzetal., author = {Reiß, Franziska and Ottov{\´a}-Jordan, Veronika and Bilz, Ludwig and Moor, Irene and Dadaczynski, Kevin and Helmchen, Ronja M. and Schierl, Theresa and Sendatzki, Saskia and Rathmann, Katharina and Kaman, Anne and Study Group Germany, HBSC and Ravens-Sieberer, Ulrike}, title = {Effects of the corona measures on the life of children and adolescents : results of the German HBSC study 2022}, series = {Journal of Health Monitoring}, volume = {2025}, journal = {Journal of Health Monitoring}, number = {10 (1)}, issn = {2511-2708}, doi = {10.25646/13002}, pages = {16}, abstract = {Background: The containment measures of the COVID-19 pandemic have changed many people's daily lives. The study examines how children and adolescents assess the impact of the coronavirus measures on various areas of life. Methods: Overall, N = 6,475 students (11 -15 years) in Germany took part in the representative 'Health Behavior in School-aged Children (HBSC)' study in 2022. Logistic regressions were performed to investigate the relationships between the perceived impact of the coronavirus measures on various areas of their lives by age, gender and family wealth. Results: Two years after the onset of the pandemic, children and adolescents reported both, positive and negative effects of the coronavirus measures. About a half of those surveyed perceived positive effects regarding social relationships. In contrast, approximately one in three respondents reported a deterioration in mental health and school performance. In particular, 11-year-olds, boys and wealthy students reported more often positive effects. Conclusions: The positive effects of the pandemic on the lives of children and adolescents in individual areas and the resilience (resistance) that is emerging here, as well as the results on more negative assessments of adolescents, girls and respondents with lower family wealth, can be used as a starting point for a needs-oriented and target group-specific health promotion in times of crisis. Future research should focus on the pandemic's long-term effects on young people's development.}, language = {en} } @misc{ReissOttovaJordanBilzetal., author = {Reiß, Franziska and Ottov{\´a}-Jordan, Veronika and Bilz, Ludwig and Moor, Irene and Dadaczynski, Kevin and Helmchen, Ronja M. and Schierl, Theresa and Sendatzki, Saskia and Rathmann, Katharina and Kaman, Anne and Deutschland, HBSC-Studienverbund and Ravens-Sieberer, Ulrike}, title = {Auswirkungen der Corona-Maßnahmen auf das Leben von Kindern und Jugendlichen: Ergebnisse der bundesweiten HBSC-Studie 2022}, series = {Journal of Health Monitoring}, volume = {10}, journal = {Journal of Health Monitoring}, number = {1}, organization = {Robert Koch-Institut, Berlin}, issn = {2511-2708}, doi = {10.25646/12954}, pages = {17}, abstract = {Hintergrund: Die Eind{\"a}mmungsmaßnahmen der COVID-19-Pandemie haben den Alltag vieler Menschen ver{\"a}ndert. Untersucht wird, wie Kinder und Jugendliche die Auswirkungen der Corona-Maßnahmen auf verschiedene Lebensbereiche einsch{\"a}tzen. Methode: An der repr{\"a}sentativen „Health Behaviour in School-aged Children (HBSC)"-Studie haben 2022 bundesweit N = 6.475 Sch{\"u}lerinnen und Sch{\"u}ler (11 -15 Jahre) teilgenommen. Mittels logistischer Regressionen wurden Zusammenh{\"a}nge zwischen den wahrgenommenen Auswirkungen der Corona-Maßnahmen auf verschiedene Bereiche ihres Lebens und den Faktoren Alter, Geschlecht und famili{\"a}rer Wohlstand untersucht. Ergebnisse: Zwei Jahre nach Pandemiebeginn berichteten Kinder und Jugendliche sowohl positive als auch negative Auswirkungen der Corona-Maßnahmen. Bei den sozialen Beziehungen nahm etwa die H{\"a}lfte der Befragten positive Auswirkungen wahr. Dagegen gab etwa jede bzw. jeder dritte Befragte Verschlechterungen bei der seelischen Gesundheit und den schulischen Leistungen an. Vor allem 11-J{\"a}hrige, Jungen und Befragte mit hohem famili{\"a}ren Wohlstand berichteten von positiven Auswirkungen. Schlussfolgerungen: Die in Einzelbereichen positiven Auswirkungen der Pandemie auf das Leben von Kindern und Jugendlichen und die sich hier abzeichnende Resilienz (Widerstandskraft) sowie die Ergebnisse zu negativeren Einsch{\"a}tzungen von Jugendlichen, M{\"a}dchen und Befragten mit niedrigerem famili{\"a}ren Wohlstand k{\"o}nnen als Ausgangspunkt f{\"u}r eine bedarfsorientierte und zielgruppenspezifische Gesundheitsf{\"o}rderung in Krisenzeiten genutzt werden. Gegenstand zuk{\"u}nftiger Forschung sollten die Langzeitfolgen der Pandemie auf die Entwicklung junger Menschen sein.}, language = {de} } @misc{FionnaErhartSchuetzetal., author = {Fionna, Zoellner and Erhart, Michael and Sch{\"u}tz, Raphael and Napp, Ann-Kathrin and Devine, Janine and Reiss, Franziska and Ravens-Sieberer, Ulrike and Kaman, Anne}, title = {Two decades of loneliness among children and adolescents : longitudinal trends, risks and resources : results from the German BELLA and COPSY studies}, series = {European child \& adolescent psychiatry}, volume = {2025}, journal = {European child \& adolescent psychiatry}, publisher = {Springer}, address = {Berlin}, issn = {1018-8827}, doi = {10.1007/s00787-025-02779-6}, pages = {1 -- 13}, abstract = {Loneliness among young people is a significant public health concern, yet research on its prevalence, longitudinal trends, and associated risk and resource factors in Germany remains limited. This paper draws on two German longitudinal panel surveys with refreshment sampling - the BELLA study (2003-2017) and the subsequent COPSY study (2020-2024), and includes ten nationwide measurement points. The sample comprised N = 3,043 participants (49.9\% female; age range 11-17 years) from the BELLA study, and N = 1,909 participants (51.0\% female; age range 11-17 years) from the COPSY study. Our findings indicate that loneliness rates remained relatively stable between 2003 and 2017 (9.5-15.5\%) but spiked dramatically in 2020 (34.6\%) during the COVID-19 pandemic. By 2024, 20.5\% of young people still reported feeling lonely at least sometimes during the past week. Consistently, girls were more likely to report loneliness than boys. Mixed model panel regression analyses identified key risk factors for loneliness, like female gender, screen time, parental mental illness, as well as mental and physical health complaints in children and adolescents. In contrast, personal, familial, and social resources were associated with lower levels of loneliness. While some degree of loneliness is a common experience in youth, persistent loneliness poses a risk to mental and physical health. Our findings underscore the need for targeted interventions, particularly in school, leisure, and family settings, where social and emotional skills can be fostered.}, language = {en} } @misc{MoorBuckschFischeretal., author = {Moor, Irene and Bucksch, Jens and Fischer, Saskia M. and Reiß, Franziska and Schierl, Theresa and Sch{\"u}tz, Raphael and Sendatzki, Saskia and Winter, Kristina and HBSC Studienverbund, and Dadaczynski, Kevin}, title = {Die Gesundheit von Sch{\"u}ler:innen in Deutschland : Ergebnisse der HBSC-Studie}, series = {Public health forum}, volume = {33}, journal = {Public health forum}, number = {2}, publisher = {De Gruyter}, address = {Berlin ; Boston, Massachusetts}, issn = {0944-5587}, doi = {10.1515/pubhef-2025-0010}, pages = {126 -- 130}, abstract = {Die HBSC-Studie ist die weltweit gr{\"o}ßte Studie zur Kinder- und Jugendgesundheit und erfasst alle vier Jahre die Gesundheit und das Gesundheitsverhalten im Schulkontext. Die aktuellen Ergebnisse in Deutschland weisen auf Handlungsbedarf in den Bereichen psychische Gesundheit, (Cyber-)Mobbing, Einsamkeit, k{\"o}rperliche Aktivit{\"a}t, Gesundheitskompetenz und gesundheitliche Chancengleichheit hin. Vor allem M{\"a}dchen, gender-diverse, {\"a}ltere und sozio{\"o}konomisch benachteiligte Heranwachsende sollten adressiert werden.}, language = {de} } @misc{SchuetzReissMooretal., author = {Sch{\"u}tz, Raphael and Reiss, Franziska and Moor, Irene and Kaman, Anne and Bilz, Ludwig}, title = {Lonely children and adolescents are less healthy and report less social support : a study on the effect of loneliness on mental health and the moderating role of social support}, series = {BMC public health}, volume = {25}, journal = {BMC public health}, publisher = {BioMed Central (BMC)}, address = {London}, issn = {1471-2458}, doi = {10.1186/s12889-025-23247-5}, pages = {1 -- 21}, abstract = {Background Loneliness among children and adolescents has been increasingly recognized as a public health issue, for example, because of its associations with mental health problems. Nevertheless, there is a lack of evidence regarding the links between loneliness and mental health and the potential buffering role of social support. Thus, this study aims to investigate the prevalence of loneliness among children and adolescents in Germany and its associations with mental health. Furthermore, we analyze whether social support is negatively correlated with loneliness and mental health problems and whether it acts as a moderator of the association between loneliness and mental health issues. Methods This study analyzed data from the Health Behavior in School-aged Children (HBSC) survey in Germany in 2022, which included 6,475 students aged 11, 13, and 15 years (girls: 50,6\%, Mage = 13,4, SD = 1,7). Loneliness was measured via the University of California-Los Angeles Scale (UCLA) and a single-item measure. The mental health indicators included subjective health, life satisfaction, and multiple psychosomatic complaints. Social support from family, teachers, and classmates was assessed. Chi-square tests, t tests, logistic regressions, and moderation analyses were conducted. Results A total of 17.2\% of the students reported high levels of loneliness. Compared with boys, girls and gender-diverse students reported higher rates of loneliness. High levels of loneliness were strongly linked to poorer subjective health (OR = 5.56, p <.001), lower life satisfaction (OR = 7.32, p <.001), and increased psychosomatic complaints (OR = 7.38, p <.001). High social support from family, teachers, and students was associated with reduced loneliness and better mental health outcomes. Teacher support in grades 7 and 9 buffered the effect of loneliness on multiple psychosomatic complaints. Conclusion The findings highlight that loneliness is a prevalent phenomenon among children and adolescents and is strongly associated with mental health issues. Greater social support is linked to reduced loneliness and better mental health, so targeted interventions to promote social support in schools and families are needed to address loneliness. Future research should explore longitudinal relationships and further elucidate the mechanisms underlying these associations.}, language = {en} }