Desenho da amostra Nascer no Brasil: Pesquisa Nacional sobre Parto e Nascimento

Abstract

This paper describes the sample design for the National Survey into Labor and Birth in Brazil. The hospitals with 500 or more live births in 2007 were stratified into: the five Brazilian regions; state capital or not; and type of governance. They were then selected with probability proportional to the number of live births in 2007. An inverse sampling method was used to select as many days (minimum of 7) as necessary to reach 90 interviews in the hospital. Postnatal women were sampled with equal probability from the set of eligible women, who had entered the hospital in the sampled days. Initial sample weights were computed as the reciprocals of the sample inclusion probabilities and were calibrated to ensure that total estimates of the number of live births from the survey matched the known figures obtained from the Brazilian System of Information on Live Births. For the two telephone follow-up waves (6 and 12 months later), the postnatal woman's response probability was modelled using baseline covariate information in order to adjust the sample weights for nonresponse in each follow-up wave.

Práticas de atenção hospitalar ao recém-nascido saudável no Brasil

“…In each of the 266 hospitals of the sample, 90 postpartum women were interviewed, a total of 23,940 subjects. Further information of the sample design is presented on Vasconcellos et al 19 .…”

Factors associated with Specific Hypertensive Gestation Syndrome (SHGS) in postpartum adolescent and young adult mothers in the Northeast of Brazil: a multiple analysis of hierarchical models

“…A cross-sectional, hospital-based epidemiological study was carried out in 191 municipalities in all States and Regions of Brazil, from February 2011 to October 2012, 7,8 whose sample was composed of 23,940 puerperal women interviewed in 266 hospitals. 8 In the national survey, the sample was selected in three stages: the first stage was composed of hospitals with 500 or more deliveries in 2007, stratified into five macroregions of the country, located in the capital of the state or interior, and type of hospital (private, public or mixed); the second stage consisted of the days of the week (minimum of seven days in each hospital), using the inverse sampling method to select as many days of research as necessary to reach 90 women interviewed at the hospital; the third stage was composed of the puerperae to be interviewed.…”

“…7,8 For this research, a secondary analysis was performed by adolescents and young adults, who were attended at maternity hospitals selected in the Northeast Region, which were part of the National Survey, composed of 68 Health Units distributed in 54 municipalities. In this sense, the studied population totaled 2,960 women, of which 1,299 were teenage puerperal women and 1,661 young adults.…”

“…The significance level of 5%, a study power of 95% and design effect of 1.3 were considered, totaling a sample size of 450 women per stratum. 8 Those that declared themselves yellow or indigenous were excluded because of the small proportion in the population.…”

Why do women in the private sector have shorter pregnancies in Brazil? Left shift of gestational age, caesarean section and inversion of the expected disparity

“…Further details on the sampling process, data collection or other information about NNB are available in Leal et al 14 , Vasconcellos et al 15 and Pereira et al 13 . Ethical aproval for the NNB Survey was granted by the Fiocruz Ethical Committee and all women who agreed in taking part of the survey signed an informed consent.…”