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PREVALENCE AND RISK FACTORS OF GERD IN ADOLESCENTS IN NOVOSIBIRSK: TEN-YEAR TRENDS. The aim of the study was the study of ten-year trends (1999-2009) of GERD symptoms and risk factors in schoolchildren in Novosibirsk from 14 to 17 years. MATERIALS AND METHODS: The comparison of the results of the screenings performed at 1999 and 2009 was analyzed. Anthropometry, the survey to identify the symptoms of GERD and eating habits, smoking and alcohol consumption, determination of lgG and CagA antibodies to Helicobacterpylori were included at the program of screenings. RESULTS: No significant dynamics of GER symptoms in adolescents, except weekly heartburn among boys. Among the factors associated with dyspepsia and GER, there have been some mixed changes: the frequency of smoking significantly reduced, but the proportion adolescents with excess body weight have increased. Violations of the regime and diet, and Helicobocrerpylori-infection has not changed significantly. CONCLUSION: The frequency of GERD in adolescents remains high but does not reach the prevalence of GERD in adults.