Baixo peso ao nascer em duas coortes de base populacional no Sul do Brasil

Horta, Bernardo Lessa; Barros, Fernando C.; Halpern, Ricardo; Victora, César G.

doi:10.1590/s0102-311x1996000500005

Cited by 62 publications

(68 citation statements)

References 9 publications

(8 reference statements)

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“…Social inequality regarding LBW rate was also observed in other Brazilian towns such as Rio de Janeiro and Pelotas (2,3). In the present study, the association of lower maternal schooling and family income with a higher LBW rate was reduced but remained statistically significant.…”

Section: Social Inequality In Low Birth Weight and Its Evolution In Rsupporting

confidence: 69%

“…Inequality in perinatal health has been well documented in the literature. Families with lower schooling and income have higher rates of low birth weight (LBW), preterm birth (PTB), intrauterine growth restriction (IUGR), and infant mortality (2)(3)(4)(5). However, few studies are available about the assessment of the evolution of social inequality along time.…”

Section: Introductionmentioning

confidence: 99%

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Social inequality and perinatal health: comparison of three Brazilian cohorts

Filho

Junior

Silva

et al. 2007

Braz J Med Biol Res

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The objective of the present study was to estimate and compare social inequality in terms of three indicators, i.e., low birth weight (LBW), preterm birth (PTB) and small for gestational age (SGA) birth, in three birth cohorts. Two cohorts were from the city of Ribeirão Preto, where data were collected for all 6748 live born singletons in 1978/79 and for one third of live born singletons (2846) in 1994. The third cohort consisted of 2443 singletons born in São Luís over a period of one year (1997/98). In Ribeirão Preto, LBW and PTB rates increased in all social strata from 1978/79 to 1994. Social inequalities regarding LBW and PTB disappeared since the increase in these rates was more accelerated in the groups with higher educational level. The percentage of SGA infants increased over the study period. Social inequality regarding SGA birth increased due to a more intense increase in SGA births in the strata with lower schooling. In São Luís, in 1997/98 there was no social inequality in LBW or PTB rates, whereas SGA birth rate was higher in mothers with less schooling. We speculate that the more accelerated increase in medical intervention, especially due to the increase in cesarean sections in the more privileged groups, could be the main factor explaining the unexpected increase in LBW and PTB rates in Ribeirão Preto and the decrease or disappearance of social inequality regarding these perinatal indicators in the two cities. Correspondence

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Section: Social Inequality In Low Birth Weight and Its Evolution In Rsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Social inequality and perinatal health: comparison of three Brazilian cohorts

Filho

Junior

Silva

et al. 2007

Braz J Med Biol Res

View full text Add to dashboard Cite

show abstract

“…Differences in low birth weight according to family income were also reported for Pelotas in 1993. 10 The present study shows some limitations. Estimation of gestational age based on the date of the last normal menstrual period is prone to error.…”

Section: Infant Mortality and Low Birth Weightmentioning

confidence: 62%

Infant mortality and low birth weight in cities of Northeastern and Southeastern Brazil

et al. 2003

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OBJECTIVE: To compare estimates of low birth weight (LBW), preterm birth, small for gestational age (SGA), and infant mortality in two birth cohorts in Brazil. METHODS: The two cohorts were performed during the 1990s, in São Luís, located in a less developed area in Northeastern Brazil, and Ribeirão Preto, situated in a more developed region in Southeastern Brazil. Data from one-third of all live births in Ribeirão Preto in 1994 were collected (2,839 single deliveries). In São Luís, systematic sampling of deliveries stratified by maternity hospital was performed from 1997 to 1998 (2,439 single deliveries). The chi-squared (for categories and trends) and Student t tests were used in the statistical analyses. RESULTS: The LBW rate was lower in São Luís, thus presenting an epidemiological paradox. The preterm birth rates were similar, although expected to be higher in Ribeirão Preto because of the direct relationship between preterm birth and LBW. Dissociation between LBW and infant mortality was observed, since São Luís showed a lower LBW rate and higher infant mortality, while the opposite occurred in Ribeirão Preto. CONCLUSIONS: Higher prevalence of maternal smoking and better access to and quality of perinatal care, thereby leading to earlier medical interventions (cesarean section and induced preterm births) that resulted in more low weight live births than stillbirths in Ribeirão Preto, may explain these paradoxes. The ecological dissociation observed between LBW and infant mortality indicates that the LBW rate should no longer be systematically considered as an indicator of social development.

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“…Six of the databases concern repeated studies conducted in Sao Luís, MA (1997-1998 and 2010, the latter as yet unpublished), 23 Ribeirao Preto, SP (1994 and 2010, the latter also unpublished) 7 and Pelotas, RS (1993,2004,2011). 3,11 These studies are population based, including birth occurring in these municipalities (generally over the period of one year) or systematic samples of all newborns. In the Ribeirao Preto and Sao Luís cohorts in the 2010-BRISA, births in households resident in the municipalities were included.…”

Section: Resultsmentioning

confidence: 99%

“…The references of all the articles were examined, although no further articles were identified. Finally, 11 texts were identified using primary data on the Northeast, South and Southeast of the country: nine articles published in journals, 1,5,7,9,11,15,17,21,23 one doctoral thesis b and one Master's dissertation. c…”

Section: Introductionmentioning

confidence: 99%

Prevalência de nascimentos pré-termo por peso ao nascer: revisão sistemática

et al. 2013

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OBJECTIVE:To estimate the prevalence of preterm birth by categories of birth weight, and to obtain an equation to correct the estimates. METHODS:Systematic review of the Brazilian literature published from 1990 to 2012, to identify studies with primary collection of data on birth weight and gestational age. Twelve studies were selected and contributed for tabulations of preterm prevalence according to 100 g birth weight categories. These results were combined using sex-specific fractional polynomial equations and the resulting curves were compared with results from the Live Birth Information System for the years 2000, 2005, 2010 and 2011. RESULTS:For all birth weight categories, preterm prevalence estimates based on primary studies had a higher prevalence than those of the the Live Birth Information System. The prevalence reported by the Live Birth Information System was of 7.2% in 2010, about 38.0% lower than the estimated prevalence of 11.7% obtained with the correctional equation. CONCLUSIONS:Information reported by the Live Birth Information System on preterm prevalence does not reflect the true magnitude of the problem in Brazil, and should not be used without the correction factors proposed in the present analyses.

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Baixo peso ao nascer em duas coortes de base populacional no Sul do Brasil

Cited by 62 publications

References 9 publications

Social inequality and perinatal health: comparison of three Brazilian cohorts

Social inequality and perinatal health: comparison of three Brazilian cohorts

Infant mortality and low birth weight in cities of Northeastern and Southeastern Brazil

Prevalência de nascimentos pré-termo por peso ao nascer: revisão sistemática

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