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BACKGROUND: Cesarean section (CS) rates are increasing worldwide and are associated with negative maternal and child health outcomes when performed without medical indication. However, there is still limited knowledge about the association between high CS rates and early-term births. This study explored the association between CSs and early-term births according to the Robson classification. METHODS: A population-based, cross-sectional study was performed with routine registration data of live births in Brazil between 2012 and 2019. We used the Robson classification system to compare groups with expected high and low CS rates. We used propensity scores to compare CSs to vaginal deliveries (1:1) and estimated associations with early-term births using logistic regression. RESULTS: A total of 17,081,685 live births were included. Births via CS had higher odds of early-term birth (OR 1.32; 95% CI 1.32-1.32) compared to vaginal deliveries. Births by CS to women in Group 2 (OR 1.50; 95% CI 1.49-1.51) and 4 (OR 1.57; 95% CI 1.56-1.58) showed the highest odds of early-term birth, compared to vaginal deliveries. Increased odds of an early-term birth were also observed among births by CS to women in Group 3 (OR 1.30, 95% CI 1.29-1.31), compared to vaginal deliveries. In addition, live births by CS to women with a previous CS (Group 5 - OR 1.36, 95% CI 1.35-1.37), a single breech pregnancy (Group 6 - OR 1.16; 95% CI 1.11-1.21, and Group 7 - OR 1.19; 95% CI 1.16-1.23), and multiple pregnancies (Group 8 - OR 1.46; 95% CI 1.40-1.52) had high odds of an early-term birth, compared to live births by vaginal delivery. CONCLUSIONS: CSs were associated with increased odds of early-term births. The highest odds of early-term birth were observed among those births by CS in Robson Groups 2 and 4.
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Cesárea , Nascimento a Termo , Criança , Gravidez , Feminino , Humanos , Brasil/epidemiologia , Estudos Transversais , Parto ObstétricoRESUMO
OBJECTIVE: To verify whether advanced maternal age (AMA), defined as women of ≥35 years, is associated with premature and early-term birth in Brazil, according to the onset of labor (spontaneous or provider-initiated). METHODS: Cross-sectional population-based study. The "Birth in Brazil" study interviewed 23 894 puerperal women between 2011 and 2012, in all regions of Brazil. The current analysis included 17 994 adult mothers and their newborns (15 448 aged between 20-34 years, and 2536 ≥ 35 years). A propensity score was used to assess the likelihood of AMA women giving birth to premature or early-term infants (spontaneous or provider-initiated) compared to women aged 20-34 years. To balance the groups, we used maternal, prenatal, and childbirth characteristics. RESULTS: The general prematurity rate was 10.24%, of which the majority of births were spontaneous (55.73%). Conversely, early-term births were more often provider-initiated (54.81%). AMA did not increase the chance of premature births, whether spontaneous or provider-initiated. However, AMA was associated with a higher rate of provider-initiated early-term birth (OR = 1.48; 95% CI: 1.23-1.77). CONCLUSION: AMA alone does not contribute to premature birth; AMA's independent association with provider-initiated early-term birth may not be based solely on clinical indications.
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Nascimento Prematuro , Adulto , Brasil/epidemiologia , Estudos Transversais , Feminino , Humanos , Recém-Nascido , Idade Materna , Gravidez , Nascimento Prematuro/epidemiologia , Nascimento a Termo , Adulto JovemRESUMO
OBJECTIVES: To investigate whether the high rates of caesarean sections (CSs) in Brazil have impacted on the prevalence of preterm and early-term births. DESIGN: Individual-level, cross-sectional analyses of a national database. SETTING: All hospital births occurring in the country in 2015. PARTICIPANTS: 2 903 716 hospital-delivered singletons in 3157 municipalities, representing >96% of the country's births. PRIMARY AND SECONDARY OUTCOME MEASURES: CS rates and gestational age distribution (<37, 37-38, 39-41 and 42 or more weeks' gestation). Outcomes were analysed according to maternal education, measured in years of schooling and municipal CS rates. Analyses were also adjusted for maternal age, marital status and parity. RESULTS: Prevalence of CS was 55.5%, preterm prevalence (<37 weeks' gestation) was 10.1% and early-term births (37-38 weeks of gestation) represented 29.8% of all births, ranging from 24.9% among women with <4 years of schooling to 39.8% among those with >12 years of education. The adjusted prevalence ratios of preterm and early-term birth were, respectively, 1.215 (1.174-1.257) and 1.643 (1.616-1.671) higher in municipalities with≥80% CS compared with those <30%. CONCLUSIONS: Brazil faces three inter-related epidemics: a CS epidemic; an epidemic of early-term births, associated with the high CS rates; and an epidemic of preterm birth, also associated with CS but mostly linked to poverty-related risk factors. The high rates of preterm and early-term births produce an excess of newborns at higher risk of short-term morbidity and mortality, as well as long-term developmental problems. Compared with high-income countries, there is an annual excess of 354 000 preterm and early-term births in Brazil.
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Cesárea/estatística & dados numéricos , Nascimento Prematuro/epidemiologia , Nascimento a Termo , Adulto , Brasil/epidemiologia , Estudos Transversais , Bases de Dados Factuais , Escolaridade , Feminino , Idade Gestacional , Humanos , Gravidez , Prevalência , Adulto JovemRESUMO
OBJECTIVE: To determine whether early term delivery (at 370/7-386/7 weeks of gestation) is associated with long-term pediatric cardiovascular morbidity of the offspring. STUDY DESIGN: A population-based cohort analysis was performed including all term deliveries occurring between 1991 and 2014 at a single tertiary medical center. Gestational age at delivery was subdivided into early term (370/7-386/7), full term (390/7-406/7), late term (410/7-416/7) and post term (≥420/7) delivery. Hospitalizations of children up to the age of 18 years involving cardiovascular morbidity were evaluated, including structural valvular disease, hypertension, arrhythmias, rheumatic fever, ischemic heart disease, pulmonary heart disease, perimyoendocarditis, congestive heart failure, and others. Kaplan-Meier survival curves were used to compare cumulative hospitalization incidence between groups. A multivariable Weibull parametric model was used to control for confounders. RESULTS: During the study period, 223 242 term singleton deliveries met the inclusion criteria. Of them, 24% (n = 53 501) occurred at early term. Hospitalizations involving cardiovascular morbidity were significantly more common in children delivered at early term (0.7%) as compared with those born at full (0.6%), late (0.6%), or post term (0.5%; P = .01). The survival curve demonstrated a significantly higher cumulative incidence of cardiovascular-related hospitalizations in the early term group (log-rank P <.001). In the Weibull model, early term delivery was found to be an independent risk factor for cardiovascular-related hospitalization as compared with full term delivery (adjusted HR, 1.16; 95% CI, 1.01-1.32; P = .02). CONCLUSION: Early term delivery is independently associated with pediatric cardiovascular morbidity of the offspring as compared with offspring born at full term.
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Doenças Cardiovasculares/epidemiologia , Doenças do Prematuro/epidemiologia , Estudos de Coortes , Feminino , Idade Gestacional , Hospitalização , Humanos , Recém-Nascido , Recém-Nascido Prematuro , MasculinoRESUMO
OBJECTIVES: To estimate the national rate of early-term live births in Brazil and to evaluate the effect of birth at 37 and 38 weeks' gestation, as compared with 39 and 40 weeks' gestation on infant outcomes according to precursors of birth and the existence of maternal/fetal medical conditions. DESIGN: National perinatal population-based cohort study. SETTING: 266 maternity services located in the five Brazilian macroregions. PARTICIPANTS: 18 652 singleton live newborns from 37 0/7 to 40 6/7 weeks of gestation. MAIN OUTCOME MEASURES: Resuscitation in delivery room, oxygen therapy, transient tachypnoea, admission to neonatal intensive care unit (NICU), hypoglycaemia, use of antibiotics, phototherapy, phototherapy after hospital discharge, neonatal death and breastfeeding. RESULTS: Early terms accounted for 35% (95% CI 33.4% to 36.7%) of all live births. Among provider-initiated births in women without medical conditions, infants of 37 and 38 weeks' gestation had higher odds of oxygen therapy (adjusted OR (AOR) 2.93, 95% CI 1.72 to 4.98 and AOR 1.92 95% CI 1.18 to 3.13), along with admission to NICU (AOR 2.01, 95% CI 1.18 to 3.41 and AOR 1.56, 95% CI 1.02 to 2.60), neonatal death (AOR 14.40, 95% CI 1.94 to 106.69 and AOR 13.76,95% CI 2.84 to 66.75), hypoglycaemia in the first 48 hours of life (AOR 7.86, 95% CI 1.95 to 31.71 and AOR 5.76, 95% CI 1.63 to 20.32), transient tachypnoea (AOR 2.98, 95% CI 1.57 to 5.65 and AOR 2.12, 95% CI 1.00 to 4.48) and the need for phototherapy within the first 72 hours of life (AOR 3.59, 95% CI 1.95 to 6.60 and AOR 2.29, 95% CI 1.49 to 3.53), yet lower odds of breastfeeding up to 1 hour after birth (AOR 0.67, 95% CI 0.53 to 0.86 and AOR 0.87, 95% CI 0.76 to 0.99) and exclusive breastfeeding during hospital stay (AOR 0.68, 95% CI 0.51 to 0.89 and AOR 0.84, 95% CI 0.71 to 0.99). CONCLUSION: Birth at 37 and 38 weeks' gestation increased the risk of most adverse infant outcomes analysed, especially among provider-initiated births and should be avoided before 39 weeks' gestation in healthy pregnancies.
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Nascido Vivo , Trabalho de Parto Prematuro/epidemiologia , Nascimento a Termo , Adolescente , Adulto , Brasil/epidemiologia , Estudos de Coortes , Parto Obstétrico/métodos , Feminino , Idade Gestacional , Humanos , Hipoglicemia/epidemiologia , Recém-Nascido , Unidades de Terapia Intensiva Neonatal , Modelos Logísticos , Avaliação de Resultados em Cuidados de Saúde , Morte Perinatal , Gravidez , Adulto JovemRESUMO
OBJECTIVES: To quantify the independent risks of neonatal (0-28 days), postneonatal (29-364 days), 1- to 5- and 6- to 30-year mortality by gestational age and investigate changes in survival over time in an Australian birth cohort. STUDY DESIGN: Maternal and birth related Western Australian population data (1980-2010) were linked to the state mortality data using a retrospective cohort study design involving 722 399 live-born singletons infants. RESULTS: When compared with 39- to 41-week born infants, the adjusted risk ratio for neonatal mortality was 124.8 (95% CI 102.9-151.3) for 24-31 weeks of gestation, 3.4 (95% CI 2.4-4.7) for 35-36 weeks of gestation, and 1.4 (95% CI 1.1-1.8) for 37-38 weeks of gestation. For 24-31 weeks of gestation infants, the adjusted hazard ratio for postneonatal mortality (29-364 days) was 13.9 (95% CI 10.9-17.6), for 1- to 5-year mortality 1.4 (95% CI 0.7-3.0) and for 6- to 30-year mortality 1.3 (95% CI 0.8-2.3). The risk of neonatal and postneonatal mortality for those born preterm decreased over time. CONCLUSIONS: In Western Australia, late preterm and early term infants experienced higher risk of neonatal and postneonatal mortality when compared with their full-term peers. There was insufficient evidence to show that gestational length was independently associated with mortality beyond 1 year of age. Neonatal and postneonatal mortality improved with each decade of the study period.
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Idade Gestacional , Doenças do Prematuro/mortalidade , Adolescente , Adulto , Estudos de Casos e Controles , Criança , Pré-Escolar , Feminino , Seguimentos , Humanos , Lactente , Recém-Nascido , Recém-Nascido Prematuro , Masculino , Razão de Chances , Estudos Retrospectivos , Fatores de Risco , Fatores de Tempo , Austrália Ocidental/epidemiologia , Adulto JovemRESUMO
Objetivo: Determinar la frecuencia, tasa de cesárea y riesgos de morbimortalidad del recién nacido a término precoz (RNTP). Material y métodos: Estudio observacional, retrospectivo, analítico. Se incluyó a neonatos únicos vivos a término, nacidos en el hospital Hipólito Unanue de Tacna durante los años 2000 a 2014 (n=45332). Se comparó a los nacidos a termino precoz de 37 a 38 6/7 semanas (n=11276), y los nacidos a termino completo de 39 a 41 6/7 semanas (n=34056). Se utilizó frecuencia y tasa por 100 nacidos vivos, odds ratio (OR) con intervalos de confianza al 95% (IC 95%), regresión logarítmica y prueba "t" para muestras independientes. Se utilizó la base de datos del Sistema Informático Perinatal. Resultados: La frecuencia de nacidos a término precoz fue 22,5 por 100 nacidos vivos, con un crecimiento logarítmico significativo (p=0,03). Representó 24,9% de todos los recién nacidos a término. La tasa de cesárea se incrementó de 31,2% a 51,1% y su crecimiento fue similar al de los término completo. Se asoció al RNTP con mayor probabilidad de tener bajo peso al nacer (OR:5,33; IC 95%: 4,50-6,30), ser pequeño para la edad gestacional (OR:3,14; IC 95%: 2,69- 3,66), nacer por cesárea (OR: 3,15; IC 95%: 3,01-3,29), tener estancia hospitalaria de 3 días a más (OR: 1,46; IC 95%: 1,39-1,54), morbilidad respiratoria (OR: 1,81; IC 95%: 1,38-2,37) como neumonía (OR:3,02; IC 95%: 1,70-5,38), membrana hialina (OR: 4,17; IC 95%: 1,56-11,33) y taquipnea transitoria (OR: 2,95; IC 95%: 1,79-4,85); y malformaciones congénitas (OR: 1,46; IC 95%: 1,17-1,82), hiperbilirrubinemia (OR: 1,23; IC 95%: 1,02-1,49) y mortalidad neonatal (OR: 2,17; IC 95%: 1,45-3,23). Conclusión: La frecuencia de recién nacidos a término precoz en el hospital Hipólito Unanue de Tacna se incrementó en los últimos 15 años y se asoció a mayor riesgo de problemas respiratorios y mortalidad neonatal
Objective: To determine the frequency, cesarean section rate and morbidity and mortality risks for early term newborns. Material and methods: Non-experimental, cross-sectional study. We included single term live neonates born in Hipolito Unanue Hospital in Tacna from 2000 to 2014 (n= 45332). Early term newborns from 37 to 38 6/7 weeks (n= 11276), were compared with full term newborns from 39 to 41 6/7 weeks (n= 34056). We used frequencies and rates per 100 live births, odds ratios (OR) with 95% confidence intervals (95% CI), logarithmic regression and "t" test for independent samples. The Perinatal Computer System database was used. Results: The frequency of preterm infants was 22.5 per 100 live newborns, with a significant logarithmic growth (p= 0.03). This accounted for 24.9% of all full term newborns. The cesarean section rate increased from 31.2% to 51.1% and its growth was similar to that of full term newborns. It was associated with a higher risk of low birth weight (OR: 5.3; 95% CI:4.5-6.3), small for gestational age babies (OR: 3.14; 95% CI: 2.69-3.66), being born by cesarean section (OR: 3.15; 95% CI: 3.01-3.29), hospital stay of 3 days or more (OR: 1.46; 95% CI: 1.39-1,54), respiratory morbidities (OR: 1.81; 95% CI: 1.38-2.37), such as pneumonia (OR: 3.02; 95% CI: 1.70-5.38), hyaline membrane (OR: 4.17; IC 95% CI: 1.56-11.33), and transient tachypnea (OR: 2.95; 95% CI: 1.79-4.85); and congenital malformations (OR: 1.46; IC 95% CI: 1.17-1.82), hyperbilirubinemia (OR: 1.23; 95% CI: 1.02-1.49), and neonatal mortality (OR: 2.17; 95% CI: 1.45-3.23). Conclusion: The frequency of early term newborns in Hipolito Unanue Hospital in Tacna increased in the last 15 years, and it was associated with an increased risk of respiratory problems and neonatal mortality
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BACKGROUND: Approximately 5-10 % of newborns require some form of resuscitationupon delivery; several factors, such as maternal abnormal conditions, gestational age and type of delivery could be responsible for this trend. This study aimed to describe the factors associated with the need for positive pressure ventilation (PPV) via a mask or endotracheal tube and the use of supplemental O2 in newborns with a gestational age greater than 34 weeks in Brazil. METHODS: We performed a cross-sectional study and obtained data from the Birth in Brazil Survey. The inclusion criterion was a gestational age ≥34 weeks. Exclusion criteria were newborns with congenital malformations, and cases with undetermined gestational age or type of delivery (vaginal, pre labor cesarean section and cesarean section during labor). The primary outcomes were need of PPV via a mask or endotracheal tube and the use of supplemental oxygen without PPV. Confounding variables, including maternal age, source of birth payment, years of maternal schooling, previous birth, newborn presentation, multiple pregnancy, and maternal obstetric risk, were analyzed. RESULTS: We included 22,720 newborns. Of these, 2974 (13.1 %) required supplementary oxygen. PPV with a bag and mask was used for 727 (3.2 %) newborns and tracheal intubation for 192 (0.8 %) newborns. Chest compression was necessary for 136 (0.6 %) newborns and drugs administered in 114 (0.5 %). 51.3 % of newborns were delivered by cesarean section, with the majority of cesarean sections (88.7 %) being performed prior to labor. Gestational age (late preterm infants: (Relative Risk-(RR) 2.46; 95 % (Confidence interval-CI 1.79-3.39), maternal obstetric risk (RR 1.59; 95 % CI1.30-1.94), and maternal age of 12-19 years old (RR 1.36; 95 % CI1.06-1.74) contributed to rates of PPV in the logistic regression analysis. Newborns aged between 37-38 weeks of gestaional age weren´t less likely to require PPV compared with those aged 39-41 weeks of gestational age. CONCLUSIONS: Late preterm infants, previous maternal obstetric risks and maternal age contributed to the higher needs of PPV and use of O2 in the delivery room. These variables need to be considered in planning care in the delivery room.
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Trabalho de Parto , Idade Materna , Oxigênio/administração & dosagem , Respiração com Pressão Positiva/estatística & dados numéricos , Adolescente , Adulto , Brasil , Criança , Estudos Transversais , Salas de Parto , Feminino , Idade Gestacional , Humanos , Recém-Nascido , Intubação Intratraqueal , Respiração com Pressão Positiva/métodos , Gravidez , Fatores de Risco , Adulto JovemRESUMO
BACKGROUND: There is a growing body of research documenting an increased risk of neonatal morbidity for late preterm infants (LPI, 34(0/7) weeks to 36(6/7) weeks) and early term infants (ETI, 37(0/7) weeks to 38(6/7) weeks) compared with term infants (TI, 39(0/7) to 41(6/7) ); however, there has been little research on outcomes beyond the first year of life. In this study, we examined respiratory outcomes of LPI and ETI in early childhood. METHODS: South Carolina Medicaid claims data for maternal delivery and infant birth hospitalisations were linked to vital records data for the years 2000 through 2003. Medicaid claims for all infants were then followed until their fifth birthday or until a break in their eligibility. Infants born between 34(0/7) and 41(6/7) weeks were eligible. Infants with congenital anomaly, birthweight below 500 g or above 6000 g, and multiple births were excluded. We fit Cox proportional hazard models from which adjusted hazard ratio (HR) and 95% confidence interval (CI) were derived. RESULTS: A total of 3476 LPI, 12 398 ETI, and 25 975 term infants were included. Both LPI and ETI were associated with an increased risk for asthma (LPI: HR 1.24, 95% CI 1.10, 1.40; ETI: HR 1.12, 95% CI 1.06, 1.19), and bronchitis (LPI: HR 1.15, 95% CI 1.00, 1.34; ETI: HR 1.13, 95% CI 1.05, 1.2) at 3 to 5 years of age. CONCLUSIONS: Late preterm infants and early term infants are at increased risk for asthma and bronchitis.
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Recém-Nascido Prematuro , Nascimento Prematuro , Transtornos Respiratórios/economia , Transtornos Respiratórios/epidemiologia , Pré-Escolar , Feminino , Humanos , Lactente , Recém-Nascido , Masculino , Medicaid , Gravidez , Modelos de Riscos Proporcionais , Transtornos Respiratórios/etiologia , South Carolina/epidemiologia , Estados Unidos/epidemiologiaRESUMO
OBJECTIVES: The objective of this study was to evaluate the association between gestational age (GA) at birth and risk of developmental delay at 8 and 18 months of corrected postnatal age. METHODS: During 2008 to 2011, infants at a corrected postnatal age of 8 or 18 months attending health centers in Santiago, Chile, were recruited. Participants completed a form on biographical and demographic characteristics and the Chilean validated version of the Ages and Stages Questionnaires, Third Edition (ASQ). Logistic regression was used to detect the capacity of GA to predict scores < -2 SDs on the basis of the Chilean ASQ reference group, in at least 1 ASQ domain, adjusted by different control variables. RESULTS: A total of 1667 infants were included in the analysis. An inverse "dose response" relationship between developmental delay risk and GA at birth was found, both in the crude and adjusted models. Compared with those born full term, the odds ratio for developmental delay risk was 1.56 for those born early term (95% confidence interval [CI]: 1.19-2.06), 2.58 for infants born late preterm (95%CI: 1.66-4.01), and 3.01 for those born moderately preterm (95%CI: 1.59-5.71). CONCLUSIONS: An inverse dose-response relationship between GA and risk of developmental delay was found in the tested population. Future prospective studies and predictive models are needed to understand whether this higher developmental risk in moderately and late preterm infants is transient and modifiable or persists throughout life, allowing for better targeting of early-intervention strategies.
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Deficiências do Desenvolvimento/diagnóstico , Deficiências do Desenvolvimento/psicologia , Idade Gestacional , Doenças do Prematuro/diagnóstico , Chile , Estudos de Coortes , Estudos Transversais , Feminino , Humanos , Lactente , Recém-Nascido , Doenças do Prematuro/psicologia , Masculino , Razão de Chances , Psicometria/estatística & dados numéricos , Valores de Referência , Fatores de Risco , Inquéritos e QuestionáriosRESUMO
La incidencia global de nacimientos a término antes de las 39 semanas ha aumentado, en parte por el auge de inducciones y cesáreas electivas antes de esta edad gestacional. Los neonatos a término precoces, aquellos nacidos entre 370/7 y 386/7 semanas, pueden tener mayor riesgo de complicaciones que los nacidos a partir de las 39 semanas. Determinar la incidencia denacimientos a término precoces y su asociación con complicaciones posnatales inmediatas. Estudio analítico de cohorte que abarcó una población de 2648 nacimientos; se estimó la incidencia de nacimientos a término precoces y su frecuencia de complicaciones posnatales. De los 2648 niños, 2144 nacieron a término. La incidencia general de nacimiento a término precoz fue 24% (635/2648), mientras que el 29,6% de todos los niños a término fue conformado por recién nacidos menores de 39 semanas (635/2144). El 16,3% (104/635) de éstos presentó alguna complicación aguda. Las causas primarias de admisión fueron las enfermedades respiratorias y la ictericia. En comparación a los nacidos a las 39 semanas, los niños a término precoces tuvieron mayor riesgo de complicaciones agudas (RR 2,1), morbilidad respiratoria (RR 4,1) y admisión a cuidados intensivos (RR 4,7). La incidencia de nacimientos a término antes de las 39 semanas es alta en nuestra poblaciòn. Los neonatos a término precoces representan un tercio de los nacidos a término y conllevan un riesgo aumentado de complicaciones. Se requieren medidas preventivaspara evitar el nacimiento no indicado antes de las 39 semanas
The global incidence of early term births has increased worldwide, primarily because of a continuous increment ininductions and cesarean sections performed before 39 weeks gestation. Early term infants, defined as those born between 370/7 and 386/7 weeks, entail a higher risk of morbidity than their full term peers. To know the incidence of early term births and theirassociation with the risk of acute neonatal complications. A cohort observational study of 2648 newborn infants was undertaken. Incidence of early term infants and frequency of admissions for acute complications were measured. 2144 infants of the whole population were full-term infants. Total incidence of early term birth was 24% (635/2648). Early term newborns represented 29.6% of all term infants (635/2144). 104 (16.3%) of all early term infants had to be admitted because of complications. Main causes ofadmission were respiratory distress and jaundice. Early term infants had an increased risk of acute complications (RR 2.1), respiratory morbidity (RR 4.1) and admission to intensive care (RR 4.7). Conclusions: The incidence of early term births in our institution is high. Early term infants have a definite risk of complications. Greater attention needs to be paid to the prevention of non-indicated births before 39 weeks gestation