The aim of the study was to investigate the prevalence of upper respiratory tract infections (URI) - as indicated by rhinosinusitis (RS), ear infections (EI), and antibiotic consumption - in a general pediatric population and evaluate the relationship between these conditions and habitual snoring and mouth breathing during sleep.A population-based cross-sectional study was performed in three medium-sized Polish cities from 2011 to 2015.4837/6963 questionnaires (69.5%) were completed, returned and analyzed. Mean age of studied group was 7.07?±?0.72 and 7.14?±?0.73 in girls and boys, respectively. Habitual mouth breathing during sleep (MB) was reported in 907 (18.7%) children and habitual snoring (HS) in 290 (6.0%). 230/290 (79.3%) of children with HS were also MB. Both HS and MB were more prevalent in boys than in girls (p?=?0.027 and p?
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