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OBJECTIVE: To verify whether folic acid supplementation during pregnancy is associated with the occurrence of maternal depressive symptoms at three months postpartum, in the 2015 Pelotas Birth Cohort. METHODS: This study included 4,046 women, who were classified into three groups: did not use folic acid supplementation during pregnancy; used during only one trimester of pregnancy; and used for two or three trimesters. Depressive symptoms were assessed at three months postpartum using the Edinburgh Postnatal Depression Scale (EPDS), at cutoff points ≥ 10 (mild symptoms) and ≥ 13 (moderate to severe intensity). RESULTS: The overall prevalence of mild symptoms was of 20.2% (95%CI 19.0-21.5), and moderate and severe was 11% (95%CI 10.0-12.0). The prevalence of EPDS ≥ 10 was of 26.8% (95%CI 24.0-29.5) among women who did not use folic acid and 18.1% for both those who used it during one trimester of pregnancy (95%CI 16.1-20.1) and those who used it for two or three trimesters (95%CI 16.0-20.2). The prevalence of EPDS ≥ 13 was of 15.7% (95%CI 13.5-17.9) in those who did not use folic acid, 9.1% (95%CI 7.5-10.6) in those who used it for one trimester, and 9.4% (95%CI 7.8-11.0) in those who used it for two or three trimesters. In the adjusted analyses, there was no statistically significant association between the use of folic acid during pregnancy and the occurrence of depressive symptoms at three months postpartum. CONCLUSION: There was no association between folic acid supplementation during pregnancy and postpartum depression at three months.

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Purpose: The purpose of this study was to find potential risk factors associated with the occurrence of developmental defects of enamel (DDE) in permanent dentition of a birth cohort in Southern Brazil. Methods: This study is a 2004 birth cohort carried out in the city of Pelotas, Rio Grande do Sul, Brazil. A subsample of 996 children was clinically examined at 12 to 13 years of age. The pre- and perinatal variables used for this study were: twin pregnancy; type of delivery; prematurity; birth weight; Apgar score in the first and fifth minute; health problems at birth; and intensive care unit admission at birth. Gender and family income variables were also collected. Some postnatal variables were collected: "hospitalization in the first 24 months"; "breastfeeding"; "respiratory diseases in the first 48 months"; "urinary infection in the first 48 months"; and "ear pain in the first 48 months." To assess an association between the presence of DDE and various risk factors, unadjusted and adjusted Poisson regression with robust variance was performed with a respective prevalence ratio. Results: The prevalence of DDE was 40.8 percent. The variables investigated did not present a statistical association with DDE. Conclusion: No association of developmental defects of enamel in permanent dentition with any of the factors investigated in this study was found.

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OBJETIVE: To assess the association of gestational age (GA) and intrauterine growth with body composition at 11 years of age. METHOD: Analysis of data from the 2004 Pelotas birth cohort, whose outcomes were fat mass (FM, kg), fat mass index (FMI, kg/m2), fat-free mass (FFM, kg), fat-free mass index (FFMI, kg/m2) - measured by air displacement plethysmography - and body mass index for age (BMI/age, Z-score). The exposures of interest were the gestational index (GA) of infants born at less than 33 weeks, from 34 to 36 and from 37 to 41, and intrauterine growth categorized as small (SGA), adequate (AGA) and large (LGA) for gestational age. Analysis of variance was used to compare means and linear regression was used to assess the strength of association. The analyses were adjusted according to variables collected at birth, such as monthly family income, maternal characteristics - education, age, pre-gestational body mass index (BMI), weight gain during pregnancy, smoking during pregnancy, type of delivery, and parity - and adolescent characteristics - skin color and birth weight. For analysis, FM and FMI underwent logarithmic transformation due to data asymmetry. RESULTS: A total of 3,401 adolescents were analyzed, including boys and girls born at less than 33 weeks, with lower FM and FFM means than those born at term. However, in the adjusted analyses, there was no association between GA and any of the outcomes in either sex. LGA boys had a 10.5% higher FMI (p = 0.026) and +0.3 BMI/age Z-score (p = 0.019) as compared to AGA boys, and LGA girls had +0.3 kg/m 2 of FFMI (p = 0.039) than AGA girls. CONCLUSION: GA was not associated with body composition at 11 years of age. However, LGA boys had higher BMI and BMI/age Z-score, and LGA girls had higher FFMI than AGA girls.

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Resumo Introdução A Organização Mundial da Saúde (OMS) recomenda o aleitamento materno exclusivo até o 6º mês de vida da criança e a sua manutenção com alimentação complementar até pelo menos os 2 anos de idade. Apesar da sua importância, a ingestão de substitutos do leite materno é altamente prevalente, sendo uma preocupação em saúde pública. Objetivo Avaliar a associação entre os tipos de leite ingeridos e o estado nutricional no primeiro ano de vida. Método Estudo longitudinal observacional com crianças brasileiras pertencentes a um estudo multicêntrico. Aos 3, 6, 9 e 12 meses de idade foram investigados os tipos de leite consumidos por meio de questionário de frequência alimentar (QFA) e foi realizada antropometria. As associações brutas e ajustadas foram avaliadas por intermédio de regressão linear. Resultados Das 2.965 duplas de mães-bebês rastreadas, 362 atenderam aos critérios e aceitaram participar do estudo (50% meninos). Aos 12 meses de idade, os maiores escores-z de peso para idade e de peso para comprimento foram observados nos meninos que consumiam apenas fórmula ou apenas leite de vaca. Os maiores escores-z de comprimento para idade foram encontrados entre as meninas que ingeriam apenas fórmula ou apenas leite de vaca aos 9 e 12 meses. Ambos foram comparados àqueles que ingeriam apenas leite materno nas mesmas idades. Conclusão Os tipos de leite consumidos associaram-se ao estado nutricional no primeiro ano de vida, sendo observadas diferenças entre os sexos. Os maiores índices antropométricos nas crianças que não recebiam leite materno chamam a atenção para a persistência futura desses desvios, em direção ao excesso de peso.

Abstract Introduction The World Health Organization (WHO) recommends exclusive breastfeeding up to the 6th month of life of the child and its maintenance with complementary feeding until at least 2 years of age. Despite its importance, the intake of breast milk substitutes is highly prevalent and a public health concern. Objective To evaluate the association between the types of milk ingested and nutritional status in the first year of life. Method Observational longitudinal study with Brazilian children from a multicentric study. At 3, 6, 9, and 12 months of age, the types of milk consumed were investigated using a food frequency questionnaire (FFQ), and anthropometric measurements were performed. Crude and adjusted associations were assessed by linear regression. Results Of the 2,965 pairs of mothers-babies screened, 362 met the criteria and accepted to participate in the study (50% of boys). At 12 months of age, higher weight-for-age and weight-for-length z-scores were observed in boys who consumed only formula or only cow's milk, compared to boys who consumed only breast milk. Higher length-for-age z-scores were found among girls who consumed only formula or only cow's milk at 9 and 12 months, compared to girls who consumed only breast milk at the same ages. Conclusion The types of milk consumed were associated with nutritional status during the first year of life, with differences between boys and girls. The higher anthropometric indexes in children who did not receive breastmilk call our attention to the persistence of such deviations toward excessive weight status in the future.

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ABSTRACT OBJECTIVE To verify whether folic acid supplementation during pregnancy is associated with the occurrence of maternal depressive symptoms at three months postpartum, in the 2015 Pelotas Birth Cohort. METHODS This study included 4,046 women, who were classified into three groups: did not use folic acid supplementation during pregnancy; used during only one trimester of pregnancy; and used for two or three trimesters. Depressive symptoms were assessed at three months postpartum using the Edinburgh Postnatal Depression Scale (EPDS), at cutoff points ≥ 10 (mild symptoms) and ≥ 13 (moderate to severe intensity). RESULTS The overall prevalence of mild symptoms was of 20.2% (95%CI 19.0-21.5), and moderate and severe was 11% (95%CI 10.0-12.0). The prevalence of EPDS ≥ 10 was of 26.8% (95%CI 24.0-29.5) among women who did not use folic acid and 18.1% for both those who used it during one trimester of pregnancy (95%CI 16.1-20.1) and those who used it for two or three trimesters (95%CI 16.0-20.2). The prevalence of EPDS ≥ 13 was of 15.7% (95%CI 13.5-17.9) in those who did not use folic acid, 9.1% (95%CI 7.5-10.6) in those who used it for one trimester, and 9.4% (95%CI 7.8-11.0) in those who used it for two or three trimesters. In the adjusted analyses, there was no statistically significant association between the use of folic acid during pregnancy and the occurrence of depressive symptoms at three months postpartum. CONCLUSION There was no association between folic acid supplementation during pregnancy and postpartum depression at three months.

RESUMO OBJETIVO Verificar se a suplementação de ácido fólico durante a gestação está associada com a ocorrência de sintomas depressivos maternos aos três meses pós-parto, na Coorte de Nascimentos de Pelotas de 2015. MÉTODOS Este estudo incluiu 4.046 mulheres, que foram classificadas em três grupos: sem suplementação de ácido fólico na gestação; uso durante apenas um trimestre da gestação;e uso durante dois ou três trimestres. Os sintomas depressivos foram avaliados aos três meses pós-parto, através da Escala de Depressão Pós-Natal de Edimburgo (EPDS), nos pontos de corte ≥ 10 (sintomas leves) e ≥ 13 (intensidade moderada a grave). RESULTADOS A prevalência geral de sintomas leves foi de 20,2% (IC95% 19,0-21,5),e moderados e graves de 11% (IC95% 10,0-12,0). Entre as mulheres que não fizeram uso de ácido fólico, a prevalência de EPDS ≥ 10 foi de 26,8% (IC95% 24,0-29,5) e 18,1% tanto entre as que utilizaram durante um trimestre da gestação (IC95% 16,1-20,1), quanto entre as que utilizaram por dois ou três trimestres (IC95% 16,0-20,2). Já a prevalência de EPDS ≥ 13 foi 15,7% (IC95% 13,5-17,9) entre as que não utilizaram ácido fólico, 9,1% (IC95% 7,5-10,6) entre as que utilizaram durante um trimestre e 9,4% (IC95% 7,8-11,0) entre as que utilizaram por dois ou três trimestres. Nas análises ajustadas, não houve associação estatisticamente significativa entre o uso de ácido fólico na gestação e a ocorrência de sintomas depressivos aos três meses pós-parto. CONCLUSÃO Não se observou associação entre a suplementação de ácido fólico na gestação e depressão pós-parto aos três meses.

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The study aimed to assess the association between sleep duration and body composition in adolescents. A cross-sectional study was performed with 1,269 adolescents from the 1997/1998 birth cohort in São Luís, Maranhão State, Brazil, 18 and 19 years of age. Sleep duration was assessed with accelerometry data. Body composition was assessed with fat mass index (FMI), lean mass index (LMI), and body mass index (BMI). Confounding factors were identified in a directed acyclic graph in DAGitty 3.0. Descriptive analyses were performed for all variables, followed by linear regression, with estimation of crude and adjusted regression coefficient with respective 95% confidence intervals (95%CI). In adolescent boys, each additional hour of sleep was associated with reductions of 0.30kg/m2 in LMI (95%CI: -0.45; -0.15), 0.26kg/m2 in FMI (95%CI: -0.48; -0.03), and 0.61kg/m2 in BMI (95%CI: -0.93; -0.30). In adolescent girls, each additional hour of sleep was associated with a reduction of 0.22kg/m2 in LMI (95%CI: -0.36; -0.07). Longer duration of sleep was associated with lower LMI in both sexes and lower FMI and BMI in boys, evidencing the importance of adequate hours of sleep for improving body composition indices.

O objetivo do estudo foi avaliar a associação entre duração de sono e composição corporal em adolescentes. Estudo transversal, com 1.269 adolescentes de 18 e 19 anos da coorte de nascimentos de 1997/1998 de São Luís, Maranhão, Brasil. A duração do sono foi avaliada a partir dos dados registrados por acelerometria. A composição corporal foi avaliada pelo o índice de massa gorda (IMG), índice de massa muscular (IMM) e índice de massa corporal (IMC). Os fatores de confusão foram identificados em gráfico acíclico direcionado no programa DAGitty 3.0. Foram realizadas análises descritivas para todas as variáveis e, posteriormente, regressão linear, com estimativa dos coeficientes de regressão brutos e ajustados, com os respectivos intervalos de 95% de confiança (IC95%). Nos adolescentes do sexo masculino, cada hora a mais de sono associou-se a reduções de 0,30kg/m2 do IMM (IC95%: -0,45; -0,15), de 0,26kg/m2 do IMG (IC95%: -0,48; -0,03) e 0,61kg/m2 do IMC (IC95%: -0,93; -0,30). Nas adolescentes, cada hora a mais de sono associou-se à redução de 0,22kg/m2 do IMM (IC95%: -0,36; -0,07). A maior duração do sono associou-se a menor IMM em ambos os sexos e menor IMG e IMC no sexo masculino, o que evidencia a importância de ter adequadas horas de sono para melhorar os índices de composição corporal.

El objetivo fue evaluar la asociación entre duración del sueño y composición corporal en adolescentes. Estudio transversal, con 1.269 adolescentes de 18 y 19 años de la cohorte de nacimientos de 1997/1998 de São Luís, Maranhão, Brasil. La duración del sueño se evaluó a partir de los datos registrados por acelerometría. La composición corporal se evaluó por el índice de masa grasa (IMG), índice de masa muscular (IMM) e índice de masa corporal (IMC). Los factores de confusión se identificaron en un gráfico acíclico dirigido en el programa DAGitty 3.0. Se realizaron análisis descriptivos para todas las variables y, posteriormente, regresión lineal, con estimación de los coeficientes de regresión brutos y ajustados, con los respectivos intervalos de 95% de confianza (IC95%). En los adolescentes del sexo masculino, cada hora más de sueño se asoció con reducciones de 0,30kg/m2 del IMM (IC95%: -0,45; -0,15), de 0,26kg/m2 del IMG (IC95%: -0,48; -0,03) y 0,61kg/m2 del IMC (IC95%: -0,93; -0,30). En las adolescentes, cada hora más de sueño se asoció a la reducción de 0,22kg/m2 del IMM (IC95%: -0,36; -0,07). La mayor duración del sueño se asoció a un menor IMM en ambos sexos y menor IMG e IMC en el sexo masculino, lo que evidencia la importancia de tener adecuadas horas de sueño para mejorar los índices de composición corporal.

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OBJECTIVE: To describe socio-economic inequalities in dental pain and dental caries in 5 and 12-year-old children enrolled in a birth cohort. METHODS: This prospective study was carried out with children enrolled in a birth cohort in Pelotas, Brazil. The main outcome was history of dental pain in the last six months, collected at 5 and 12 years of age. Dental caries was evaluated as a secondary outcome. Inequalities dimensions were investigated using maternal education and family income. The inequalities indicators used were the slope index of inequality (SII) and the concentration index (CIX). RESULTS: Some 1,114 and 990 children were included in the analyses at the 5- and 12-year follow-ups, respectively. The prevalence of dental pain was 16.5% (95% CI 14.4-18.8) at 5 years and 31.6% (95% CI 28.7-34.6) at 12 years. Regarding SII, the difference in the prevalence of dental pain was 14 and 11 percentage points at 5 and 12 years, respectively, when comparing the less to the more maternal schooled strata. Relative inequalities (CIX) were found for dental pain only at age 12, considering family income (-5.8 CI95% -11.0; -0.6). Absolute socio-economic inequalities were also observed for dental caries in both ages. CONCLUSION: Dental pain in the last six months and dental caries was unequally distributed. Economically disadvantaged groups had the highest prevalence of dental pain and dental caries in both dentitions. Actions to tackle socio-economic inequalities must be designed throughout life.

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O objetivo do estudo foi avaliar a associação entre duração de sono e composição corporal em adolescentes. Estudo transversal, com 1.269 adolescentes de 18 e 19 anos da coorte de nascimentos de 1997/1998 de São Luís, Maranhão, Brasil. A duração do sono foi avaliada a partir dos dados registrados por acelerometria. A composição corporal foi avaliada pelo o índice de massa gorda (IMG), índice de massa muscular (IMM) e índice de massa corporal (IMC). Os fatores de confusão foram identificados em gráfico acíclico direcionado no programa DAGitty 3.0. Foram realizadas análises descritivas para todas as variáveis e, posteriormente, regressão linear, com estimativa dos coeficientes de regressão brutos e ajustados, com os respectivos intervalos de 95% de confiança (IC95%). Nos adolescentes do sexo masculino, cada hora a mais de sono associou-se a reduções de 0,30kg/m2 do IMM (IC95%: -0,45; -0,15), de 0,26kg/m2 do IMG (IC95%: -0,48; -0,03) e 0,61kg/m2 do IMC (IC95%: -0,93; -0,30). Nas adolescentes, cada hora a mais de sono associou-se à redução de 0,22kg/m2 do IMM (IC95%: -0,36; -0,07). A maior duração do sono associou-se a menor IMM em ambos os sexos e menor IMG e IMC no sexo masculino, o que evidencia a importância de ter adequadas horas de sono para melhorar os índices de composição corporal.

The study aimed to assess the association between sleep duration and body composition in adolescents. A cross-sectional study was performed with 1,269 adolescents from the 1997/1998 birth cohort in São Luís, Maranhão State, Brazil, 18 and 19 years of age. Sleep duration was assessed with accelerometry data. Body composition was assessed with fat mass index (FMI), lean mass index (LMI), and body mass index (BMI). Confounding factors were identified in a directed acyclic graph in DAGitty 3.0. Descriptive analyses were performed for all variables, followed by linear regression, with estimation of crude and adjusted regression coefficient with respective 95% confidence intervals (95%CI). In adolescent boys, each additional hour of sleep was associated with reductions of 0.30kg/m2 in LMI (95%CI: -0.45; -0.15), 0.26kg/m2 in FMI (95%CI: -0.48; -0.03), and 0.61kg/m2 in BMI (95%CI: -0.93; -0.30). In adolescent girls, each additional hour of sleep was associated with a reduction of 0.22kg/m2 in LMI (95%CI: -0.36; -0.07). Longer duration of sleep was associated with lower LMI in both sexes and lower FMI and BMI in boys, evidencing the importance of adequate hours of sleep for improving body composition indices.

El objetivo fue evaluar la asociación entre duración del sueño y composición corporal en adolescentes. Estudio transversal, con 1.269 adolescentes de 18 y 19 años de la cohorte de nacimientos de 1997/1998 de São Luís, Maranhão, Brasil. La duración del sueño se evaluó a partir de los datos registrados por acelerometría. La composición corporal se evaluó por el índice de masa grasa (IMG), índice de masa muscular (IMM) e índice de masa corporal (IMC). Los factores de confusión se identificaron en un gráfico acíclico dirigido en el programa DAGitty 3.0. Se realizaron análisis descriptivos para todas las variables y, posteriormente, regresión lineal, con estimación de los coeficientes de regresión brutos y ajustados, con los respectivos intervalos de 95% de confianza (IC95%). En los adolescentes del sexo masculino, cada hora más de sueño se asoció con reducciones de 0,30kg/m2 del IMM (IC95%: -0,45; -0,15), de 0,26kg/m2 del IMG (IC95%: -0,48; -0,03) y 0,61kg/m2 del IMC (IC95%: -0,93; -0,30). En las adolescentes, cada hora más de sueño se asoció a la reducción de 0,22kg/m2 del IMM (IC95%: -0,36; -0,07). La mayor duración del sueño se asoció a un menor IMM en ambos sexos y menor IMG e IMC en el sexo masculino, lo que evidencia la importancia de tener adecuadas horas de sueño para mejorar los índices de composición corporal.

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ABSTRACT OBJETIVE To assess the association of gestational age (GA) and intrauterine growth with body composition at 11 years of age. METHOD Analysis of data from the 2004 Pelotas birth cohort, whose outcomes were fat mass (FM, kg), fat mass index (FMI, kg/m2), fat-free mass (FFM, kg), fat-free mass index (FFMI, kg/m2) - measured by air displacement plethysmography - and body mass index for age (BMI/age, Z-score). The exposures of interest were the gestational index (GA) of infants born at less than 33 weeks, from 34 to 36 and from 37 to 41, and intrauterine growth categorized as small (SGA), adequate (AGA) and large (LGA) for gestational age. Analysis of variance was used to compare means and linear regression was used to assess the strength of association. The analyses were adjusted according to variables collected at birth, such as monthly family income, maternal characteristics - education, age, pre-gestational body mass index (BMI), weight gain during pregnancy, smoking during pregnancy, type of delivery, and parity - and adolescent characteristics - skin color and birth weight. For analysis, FM and FMI underwent logarithmic transformation due to data asymmetry. RESULTS A total of 3,401 adolescents were analyzed, including boys and girls born at less than 33 weeks, with lower FM and FFM means than those born at term. However, in the adjusted analyses, there was no association between GA and any of the outcomes in either sex. LGA boys had a 10.5% higher FMI (p = 0.026) and +0.3 BMI/age Z-score (p = 0.019) as compared to AGA boys, and LGA girls had +0.3 kg/m 2 of FFMI (p = 0.039) than AGA girls. CONCLUSION GA was not associated with body composition at 11 years of age. However, LGA boys had higher BMI and BMI/age Z-score, and LGA girls had higher FFMI than AGA girls.

RESUMO OBJETIVO Avaliar a associação da idade gestacional (IG) e crescimento intrauterino com a composição corporal aos 11 anos de idade. MÉTODO Análise de dados da coorte de nascimentos de Pelotas de 2004, cujos desfechos foram massa gorda (MG, kg), índice de massa gorda (IMG, kg/m2), massa livre de gordura (MLG, kg), índice de massa livre de gordura (IMLG, kg/m2) - medidos por pletismografia por deslocamento de ar -, e índice de massa corporal para idade (IMC/Idade, escore-Z). Sendo as exposições de interesse o índice gestacional (IG) de nascidos com menos de 33 semanas, de 34 a 36 e de 37 a 41, e crescimento intrauterino categorizado em pequeno para a idade gestacional (PIG), adequado (AIG) e grande (GIG). Para comparar médias, utilizou-se análise de variância e, para avaliar a força de associação, regressão linear. As análises foram ajustadas de acordo com variáveis coletadas ao nascer, como renda familiar mensal, características maternas - escolaridade, idade, índice de massa corporal (IMC) pré-gestacional, ganho de peso na gestação, tabagismo na gestação, tipo de parto e paridade - e características dos adolescentes - cor da pele e peso ao nascer. Para análise, o MG e o IMG sofreram transformação logarítmica devido a assimetria dos dados. RESULTADOS Foram analisados 3.401 adolescentes, entre meninos e meninas nascidos com menos de 33 semanas, com médias de MG e MLG menores que as dos nascidos(as) a termo. Porém, nas análises ajustadas, não houve associação entre IG e qualquer um dos desfechos em ambos os sexos. Meninos GIG apresentaram IMG 10,5% maior (p = 0,026) e +0,3 escore-Z de IMC/Idade (p = 0,019) em relação aos AIG, e meninas GIG apresentaram +0,3 kg/m2 de IMLG (p = 0,039) do que as AIG. CONCLUSÃO A IG não se associou à composição corporal aos 11 anos. Entretanto, meninos GIG apresentaram maiores IMG e escore-Z de IMC/Idade e meninas GIG, maior IMLG, quando comparados aos AIG.

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OBJECTIVE: To analyze early and late maternal complications associated with the mode of delivery in a birth cohort in Brazil, using the propensity score technique for analysis. METHODS: This is a prospective cohort study, using data from the Pelotas Birth Cohort, RS, 2004. A total of 4,189 women were included and a descriptive analysis of the data and subsequent calculation of the propensity and pairing score of vaginal delivery women and cesarean delivery women with similar scores (1,366 pairs). We then assessed the difference in outcome risk between the groups. RESULTS: Women in the cesarean group had 2.9 percentage points (pp) more risk of postpartum infection, 1.13 p.p. more risk of urinary infection, 1.10 p.p. more risk of anesthetic complications and 1.24 p.p. higher risk of headache compared to vaginal delivery, but less risk of anemia (-2.43 pp) and hemorrhoids (-1.24 p.p.). The use of propensity scores is extremely useful for reducing bias and increasing accuracy in observational studies when experimental studies cannot be performed. CONCLUSION: Cesarean sections have been associated with a higher prevalence of postpartum and urinary tract infections, anesthetic complications and headache and lower prevalence of anemia and hemorrhoids, so they should be performed with clear indications and when their benefits outweigh potential risks.

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