Cohort Profile: The 2015 Pelotas (Brazil) Birth Cohort Study

Hallal, Pedro Curi; Bertoldi, Andréa Dâmaso; Domingues, Marlos Rodrigues; Silveira, Mariângela Freitas da; Demarco, Flávio Fernando; Silva, Inácio Crochemore Mohnsam da; Barros, Fernando C.; Victora, Cesar G; Bassani, Diego G.

doi:10.1093/ije/dyx219

Cited by 148 publications

(168 citation statements)

References 10 publications

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“…The other Pelotas cohorts asked directly to the mother whether she smoked during pregnancy (yes/no). Further information on the methodology of these studies has been published elsewhere Barros et al 2006Barros et al , 2008Hallal et al 2017).…”

Section: Methodsmentioning

confidence: 99%

“…Those mothers who lived in the urban area of the city were interviewed on demographic, socioeconomic, reproductive, behavioral, careseeking, and morbidity variables. Interviews were conducted by a trained fieldworker, within the first 48 h after delivery, while mothers were still in the hospitals Barros et al 2006Barros et al , 2008Hallal et al 2017).…”

Section: Participants and Proceduresmentioning

confidence: 99%

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Maternal pregnancy smoking in three Brazilian cities: trends and differences according to education, income, and age

Mola

Cardoso

Batista

et al. 2020

Int J Public Health

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Objectives To estimate and assess pregnancy smoking trends since 1978, according to sociodemographic characteristics, in three Brazilian sites. Methods We used cross-sectional data from the perinatal studies of nine birth cohorts, located in the southeast (Ribeirão and 2010) regions of Brazil. We estimated the prevalence of pregnancy smoking at each time point according to age, education, and family income, in each cohort, and evaluated smoking trends. Results We analyzed data of 17,275 women in Ribeirão Preto, 19,819 in Pelotas, and 7753 in São Luís. Smoking decreased by 59% in Ribeirão Preto (p \ 0.001), 54% in Pelotas (p \ 0.001), and 32% in São Luís (p \ 0.001). However, among those with 0-4 years of education, smoking did not change in Ribeirão Preto (p-trend = 0.501) nor São Luís (p = 0.556) and increased in Pelotas (p-trend = 0.003).Conclusions Pregnancy smoking has been declining during the last decades. However, among less-educated women, pregnancy smoking did not change in two sites and increased in one of them.

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Section: Methodsmentioning

confidence: 99%

Section: Participants and Proceduresmentioning

confidence: 99%

Maternal pregnancy smoking in three Brazilian cities: trends and differences according to education, income, and age

Mola

Cardoso

Batista

et al. 2020

Int J Public Health

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“…The 2015 Pelotas (Brazil) birth cohort 16 is the fourth edition of the series of Pelotas (Brazil) birth cohort studies, preceded by cohorts initiated in 1982 17 , 1993 18 , and 2004 19 . The original study began with the follow-up of participants during prenatal care, between May 2014 and December 2015, to identify pregnant women expected to give birth during 2015.…”

Section: Introductionmentioning

confidence: 99%

Fetal, neonatal, and post-neonatal mortality in the 2015 Pelotas (Brazil) birth cohort and associated factors

et al. 2019

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This study aimed to describe fetal, neonatal, and post-neonatal mortality and associated factors in participants of the 2015 Pelotas (Brazil) birth cohort. The child mortality sub-study followed up all deaths in the first year of life. Data were collected on intrauterine fetal deaths (weight ≥ 500g and/or gestational age ≥ 20 weeks), neonatal deaths (< 28 days of life), and post-neonatal deaths (from 28 days to the end of the first year of life). Descriptive analyses using the Pearson chi-square test and a multinomial logistic regression to estimate the risk of fetal, neonatal, and post-neonatal deaths compared to live infants in the cohort (reference group) were performed. Data from 4,329 eligible births were collected, of which 54 died during the fetal period. Of the 4,275 eligible live births, 59 died in the first year of life. An association between fetal, neonatal, and post-neonatal deaths (OR = 15.60, 7.63, and 5.51 respectively) was found, as well as less than six prenatal consultations. Compared to live infants, fetal deaths were more likely to occur in non-white mothers, and neonatal deaths were 14.09 times more likely to occur in a preterm gestational age (< 37 weeks). Compared to live infants, infants that were born in a C-section delivery had 3.71 increased odds of post-neonatal death. Additionally, neonatal deaths were 102.37 times more likely to have a low Apgar score on the fifth minute after birth. These findings show the need for early interventions during pregnancy, ensuring access to adequate prenatal care.

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“…Accelerometry data was collected between weeks 16 and 24 of gestation. Details regarding this study have been previously described elsewhere [17]. Ethical approval for this study was obtained from the Ethics Committee of the Physical Education School - Federal University of Pelotas, in accordance with official letter numbered 522/064, approved the study.…”

Section: Methodsmentioning

confidence: 99%

How many days are needed to estimate accelerometry-assessed physical activity during pregnancy? Methodological analyses based on a cohort study using wrist-worn accelerometer

Silva

Evenson

Ekelund

et al. 2019

Preprint

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Background: Objective methods to measure physical activity (PA) can lead to better cross-cultural comparisons, monitoring temporal PA trends, and measuring the effect of interventions. However, when applying this technology in field-work, the accelerometer data processing is prone to methodological issues. One of the most challenging issues relates to standardizing total wear time to provide reliable data across participants. It is generally accepted that at least 4 complete days of accelerometer wear represent a week for adults. It is not known if this same assumption holds true for pregnant women. Aim: We assessed the optimal number of days needed to obtain reliable estimates of overall PA and moderate-to-vigorous physical activity (MVPA) during pregnancy using a raw triaxial wrist-worn accelerometer. Methods: Cross-sectional analyses were carried out in the antenatal wave of the 2015 Pelotas (Brazil) Birth Cohort Study. Participants wore the wrist ActiGraph wGT3X-BT accelerometer for seven consecutive days. The daily average acceleration, which indicates overall PA, was measured as milli-g (mg), and time spent in MVPA (minutes/day) was analyzed in 5-minute bouts. ANOVA and Kruskal-Wallis tests were used to compare variability across days of the week. Bland-Altman plots and Spearman-Brown Prophecy Formula were applied to determine the reliability coefficient associated with one to seven days of measurement. Analyses were stratified by sociodemographic factors and nutritional status. Results: Among 2,082 pregnant women who wore the accelerometer for seven complete days, overall and MVPA were lower on Sundays compared to other days of the week. Reliability of >=0.80 to evaluate overall PA was reached with at least three monitoring days, whereas six days were needed to estimate reliable measures of MVPA. Conclusions: Our findings indicate that the usual approach obtaining one week of accelerometry in adults is also appropriate for pregnant women, particularly to obtain differences on weekend days and reliably estimate MVPA.

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Cohort Profile: The 2015 Pelotas (Brazil) Birth Cohort Study

Cited by 148 publications

References 10 publications

Maternal pregnancy smoking in three Brazilian cities: trends and differences according to education, income, and age

Maternal pregnancy smoking in three Brazilian cities: trends and differences according to education, income, and age

Fetal, neonatal, and post-neonatal mortality in the 2015 Pelotas (Brazil) birth cohort and associated factors

How many days are needed to estimate accelerometry-assessed physical activity during pregnancy? Methodological analyses based on a cohort study using wrist-worn accelerometer

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