RESUMO Objetivo: Analisar a associação da composição domiciliar com comportamentos de risco em adolescentes. Métodos: Estudo transversal, com amostra nacionalmente representativa de adolescentes brasileiros (n=159.245) de 13 a 17 anos, matriculados e frequentando regularmente do sétimo ao nono anos do ensino fundamental e da primeira à terceira séries do ensino médio, participantes da Pesquisa Nacional de Saúde do Escolar em 2019. Os comportamentos de risco foram prática insuficiente de atividade física, comportamento sedentário, consumo de bebida alcoólica, tabagismo, pior qualidade da dieta, omissão do café da manhã e não realização de refeições com pais/responsáveis. Nas análises, que foram estratificadas pelo tipo de escola (pública ou privada) e estimadas por modelos de regressão de Poisson, foram considerados os pesos amostrais e o desenho do estudo. Resultados: Adolescentes de escolas públicas e privadas, que moravam em domicílios monoparentais ou sem nenhum dos pais, apresentaram maior prevalência de consumo de bebida alcóolica, tabagismo, pior qualidade da dieta, omissão do café da manhã e não realização de refeições com pais/responsáveis comparados àqueles que moravam com ambos os pais. Adicionalmente, entre adolescentes de escolas públicas, aqueles que viviam em domicílios monoparentais apresentaram maior prevalência de comportamento sedentário. Dos adolescentes de escolas privadas, apresentaram maior prevalência de comportamento sedentário aqueles que moravam apenas com a mãe e maior prevalência de prática insuficiente de atividade física os que moravam sem nenhum dos pais. Conclusão: Adolescentes brasileiros, de escolas públicas e privadas, que residiam em domicílios monoparentais ou sem os pais, apresentaram maiores prevalências de comportamentos de risco. Objetivo Métodos transversal n=159.245 n159245 n 159 245 (n=159.245 1 médio 2019 alcoólica tabagismo dieta paisresponsáveis pais responsáveis análises pública privada Poisson estudo Resultados privadas alcóolica Adicionalmente Conclusão n=159.24 n15924 15 24 (n=159.24 201 n=159.2 n1592 2 (n=159.2 20 n=159. n159 (n=159. n=159 n15 (n=159 n=15 n1 (n=15 n=1 (n=1 n= (n= (n

ABSTRACT Objective: To analyze the association of household composition with risk behaviors in Brazilian adolescents. Methods: Cross-sectional study, with a nationally representative sample of Brazilian adolescents (n=159,245) aged 13 to 17, enrolled and regularly attending the 7th to 9th year of elementary school and the 1st to 3rd year of high school, participants in the National Survey of School Health in 2019. The risk behaviors were: insufficient physical activity, sedentary behavior, alcohol consumption, smoking, poorer diet quality, skipping breakfast and not having meals with parents/guardians. In the analyses, the sampling weights and study design were considered, stratified by the type of school (public or private) and estimated using Poisson regression models. Results: Adolescents, from public and private schools, who lived in single-parent households or where parents were absent, had a higher prevalence of alcohol consumption, smoking, poorer diet quality, skipping breakfast and not eating meals with parents/guardians, compared to those who lived with both parents. Additionally, adolescents from public schools showed a higher prevalence of sedentary behavior than those from single-parent households. Adolescents from private schools had a higher prevalence of sedentary behavior among those who lived only with their mother and a higher prevalence of insufficient physical activity among those who lived without either parent. Conclusion: Brazilian adolescents, from public and private schools, who lived in single-parent households or without parents, showed higher prevalence of risk behaviors. Objective Methods Crosssectional Cross sectional n=159,245 n159245 n 159 245 (n=159,245 1 17 th st rd 2019 consumption smoking quality parentsguardians guardians parents/guardians analyses considered models Results singleparent single parent absent Additionally Conclusion n=159,24 n15924 15 24 (n=159,24 201 n=159,2 n1592 2 (n=159,2 20 n=159, n159 (n=159, n=159 n15 (n=159 n=15 n1 (n=15 n=1 (n=1 n= (n= (n

ABSTRACT Objective: To analyze the association of household composition with risk behaviors in Brazilian adolescents. Methods: Cross-sectional study, with a nationally representative sample of Brazilian adolescents (n=159,245) aged 13 to 17, enrolled and regularly attending the 7th to 9th year of elementary school and the 1st to 3rd year of high school, participants in the National Survey of School Health in 2019. The risk behaviors were: insufficient physical activity, sedentary behavior, alcohol consumption, smoking, poorer diet quality, skipping breakfast and not having meals with parents/guardians. In the analyses, the sampling weights and study design were considered, stratified by the type of school (public or private) and estimated using Poisson regression models. Results: Adolescents, from public and private schools, who lived in single-parent households or where parents were absent, had a higher prevalence of alcohol consumption, smoking, poorer diet quality, skipping breakfast and not eating meals with parents/guardians, compared to those who lived with both parents. Additionally, adolescents from public schools showed a higher prevalence of sedentary behavior than those from single-parent households. Adolescents from private schools had a higher prevalence of sedentary behavior among those who lived only with their mother and a higher prevalence of insufficient physical activity among those who lived without either parent. Conclusion: Brazilian adolescents, from public and private schools, who lived in single-parent households or without parents, showed higher prevalence of risk behaviors.

RESUMO Objetivo: Analisar a associação da composição domiciliar com comportamentos de risco em adolescentes. Métodos: Estudo transversal, com amostra nacionalmente representativa de adolescentes brasileiros (n=159.245) de 13 a 17 anos, matriculados e frequentando regularmente do sétimo ao nono anos do ensino fundamental e da primeira à terceira séries do ensino médio, participantes da Pesquisa Nacional de Saúde do Escolar em 2019. Os comportamentos de risco foram prática insuficiente de atividade física, comportamento sedentário, consumo de bebida alcoólica, tabagismo, pior qualidade da dieta, omissão do café da manhã e não realização de refeições com pais/responsáveis. Nas análises, que foram estratificadas pelo tipo de escola (pública ou privada) e estimadas por modelos de regressão de Poisson, foram considerados os pesos amostrais e o desenho do estudo. Resultados: Adolescentes de escolas públicas e privadas, que moravam em domicílios monoparentais ou sem nenhum dos pais, apresentaram maior prevalência de consumo de bebida alcóolica, tabagismo, pior qualidade da dieta, omissão do café da manhã e não realização de refeições com pais/responsáveis comparados àqueles que moravam com ambos os pais. Adicionalmente, entre adolescentes de escolas públicas, aqueles que viviam em domicílios monoparentais apresentaram maior prevalência de comportamento sedentário. Dos adolescentes de escolas privadas, apresentaram maior prevalência de comportamento sedentário aqueles que moravam apenas com a mãe e maior prevalência de prática insuficiente de atividade física os que moravam sem nenhum dos pais. Conclusão: Adolescentes brasileiros, de escolas públicas e privadas, que residiam em domicílios monoparentais ou sem os pais, apresentaram maiores prevalências de comportamentos de risco.

ABSTRACT OBJECTIVE To systematically review the results of the association between breakfast skipping and cardiometabolic risk factors in adolescents. METHODS The articles were searched in May 2020 from PubMed, Virtual Health Library, Scopus, Web of Science and Scientific Electronic Library Online (SciELO). The review included observational studies conducted with adolescents (10–19 years old), which estimated the association of breakfast skipping with at least one outcome (markers of body adiposity, blood pressure, serum lipid and glucose levels). Regarding the risk of bias, the articles were evaluated using the Research Triangle Institute (RTI) Item Bank on bias risk and accuracy of observational studies. The quality of the evidence was assessed by the Grade rating. RESULTS A total of 43 articles involving 192,262 participants met the inclusion criteria and were considered in this review. The prevalence of breakfast skipping ranged from 0.7% to 94% and 60.5% of studies were classified with low risk of bias. The significant association between breakfast skipping and cardiometabolic risk factors was found in twenty-nine cross-sectional articles (n = 106,031) and four longitudinal articles (n = 5,162) for excess adiposity, in three articles (n = 8,511) for high total cholesterol levels, low-density lipoprotein and triglycerides, and in three studies (n = 6,303) for high blood pressure levels. However, there was no significant association between breakfast skipping and glycemic profile. According to the Grade rating, all the associations had low quality of evidence. CONCLUSION The results of this review suggest that breakfast skipping is associated with cardiometabolic risk factors in adolescents aged 10 to 19 years. However, considering the low quality of the evidence, the present results should be interpreted carefully. In addition, our findings highlight the importance of standardizing the definition of breakfast skipping and that more prospective studies are needed to determine how skipping breakfast can affect cardiometabolic risk factors in the long time.

ABSTRACT OBJECTIVE To systematically review the results of the association between breakfast skipping and cardiometabolic risk factors in adolescents. METHODS The articles were searched in May 2020 from PubMed, Virtual Health Library, Scopus, Web of Science and Scientific Electronic Library Online (SciELO). The review included observational studies conducted with adolescents (10–19 years old), which estimated the association of breakfast skipping with at least one outcome (markers of body adiposity, blood pressure, serum lipid and glucose levels). Regarding the risk of bias, the articles were evaluated using the Research Triangle Institute (RTI) Item Bank on bias risk and accuracy of observational studies. The quality of the evidence was assessed by the Grade rating. RESULTS A total of 43 articles involving 192,262 participants met the inclusion criteria and were considered in this review. The prevalence of breakfast skipping ranged from 0.7% to 94% and 60.5% of studies were classified with low risk of bias. The significant association between breakfast skipping and cardiometabolic risk factors was found in twenty-nine cross-sectional articles (n = 106,031) and four longitudinal articles (n = 5,162) for excess adiposity, in three articles (n = 8,511) for high total cholesterol levels, low-density lipoprotein and triglycerides, and in three studies (n = 6,303) for high blood pressure levels. However, there was no significant association between breakfast skipping and glycemic profile. According to the Grade rating, all the associations had low quality of evidence. CONCLUSION The results of this review suggest that breakfast skipping is associated with cardiometabolic risk factors in adolescents aged 10 to 19 years. However, considering the low quality of the evidence, the present results should be interpreted carefully. In addition, our findings highlight the importance of standardizing the definition of breakfast skipping and that more prospective studies are needed to determine how skipping breakfast can affect cardiometabolic risk factors in the long time.

Objetivou-se por meio deste estudo avaliar as características estruturais, produtivas e o valor nutritivo do capim-Tifton 85 adubado com duas doses de nitrogênio em quatro idades de rebrota. Foi utilizado delineamento em blocos casualizados seguindo esquema fatorial 4 x 2, com 4 idades de rebrota (28, 35, 42 e 49 dias) e duas doses de nitrogênio (100 e 300 kg ha-1) com seis repetições, totalizando 48 unidades experimentais de 25 m² (5x5m) cada. O critério de blocagem foi à variação na área experimental. A produção de matéria seca incrementou linearmente, em média 56.4%, à medida que avançou a idade de rebrota de 28 para 49 dias (P<0,01). Entre as doses de N, houve aumento de 17.2% na produção de matéria seca quando adubado com 300 kg ha-1 de nitrogênio. A altura das plantas (P<0,01), assim como o número de folhas vivas (P<0,01), número de folhas expandidas (P<0,01) e o comprimento final da folha (P<0,01) aumentaram linearmente com o avanço da idade corte. A adubação do capim Tifton 85 com 100 kg ha-1 de N, manejado a cada 35 dias melhora a produção de matéria seca, características estruturais e valor nutricional da forragem para corte e/ou pastejo.

The objective of this study was to evaluate the structural, productive and nutritional value of Tifton 85 grass fertilized with two nitrogen doses at four regrowth ages. The experimental design was a randomized block in a factorial 4 x 2, with four regrowth ages (28, 35, 42 and 49 days) and two levels of nitrogen (100 and 300 kg ha-1) in six replicates, totaling 48 experimental units, of 25 m² (5x5m) each. The blocking criterion was the variation in the experimental area. Dry matter production increased linearly, on average 56.4%, as the regrowth age increased from 28 to 49 days (P<0.01). Among the N rates, there was a 17.2% increase in dry matter yield when fertilized with 300 kg / ha of nitrogen. The height of the plants (P <0.01), as well as the number of live leaves (P <0.01), number of expanded leaves (P <0.01) and the final leaf length (P <0.01) increased linearly with the advancement of cut age. Fertilization of Tifton 85 grass with 100 kg ha-1 of N, managed every 35 days improves the dry matter production, structural characteristics and nutritional value of forage for cutting and / or grazing.