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Through simple logistic regression, mouth breathers were more likely to show difficulties when compared to controls, in the tasks of:
1) Mathematical operations (4 times), mainly involving attention (4×), algorithm (4×) and combined errors (18×);
2) Resolution of mathematical problems (8×), with chance of attention errors (10×) and problems interpretation (9×) The mouth breathing pattern impairs the learning of mathematics | Fensterseifer et al (2013), 20 Porto Alegre, Rio Grande do Sul, Brazil | - Clinical neuropediatric, psychological, and social assessment; - Clinical otorhinolaryngological, instrumental and imaging assessment (oroscopy, anterior rhinoscopy, cavum X-ray, and echo-rhinometry); - Learning disability defined by history of, at least, two consecutive years of school failure for the experimental group and - Statistical analysis: Mann–Whitney test and Student's t -test with significance value of p < 0.5 | - 48 schoolchildren; - Ages between 8 and 12 years (mean: 9.1); - Group I - 24 students with learning disabilities; - Group II (Control) - 24 students without learning disabilities; - 18 (37.5%) were females and 30 males (62.5%); - All students attended public schools | Nasal obstruction tended to be higher in patients with learning difficulties. There was a statistically significant association between learning disabilities and pharyngeal tonsillar and palatine hypertrophy | Students with tonsillar hypertrophy, mouth breathers, have greater difficulty in learning compared to children without hypertrophy |
Perilo et al (2013), 21 Belo Horizonte, Minas Gerais, Brazil | - Respiratory Characteristic Assessment Questionnaire; - Assessment of the usual lip position by observing the child for 5 min (by two evaluators); - Protocol of Assessment of Cognitive-Linguistic Skills - collective version, Brazilian adaptation: alphabet recognition in sequence, copy of shapes, writing under dictation, arithmetic and short-term memory, and - Statistical analysis: Mann–Whitney and Kruskal Wallis test with p <0.01 for statistically significant correlations | - 131 schoolchildren (66 4th graders and 65 3rd graders from elementary school); - Both genders (distribution was not mentioned); - Ages 9 to 10 years (mean not mentioned); - All students attended public schools | There was no significant association between the performance of cognitive-linguistic skills and the presence of respiratory characteristics among the sample schoolchildren | There was no association between mouth breathing and learning disabilities |
Kuroishi et al (2015), 22 Ribeirao Preto, Sao Paulo, Brazil | - Clinical Interview; - Pure tone audiometry; - Otorhinolaryngological assessment by clinical and imaging assessment (oroscopy, rhinoscopy ... |
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