Association between preterm birth and its subtypes and maternal sociodemographic characteristics during the post transitional phase in a developing country with a very high human development index
Author
dc.contributor.author
Araya Bannout, Marcela
Author
dc.contributor.author
Díaz, M.
Author
dc.contributor.author
Paredes Fernández, Daniela
Author
dc.contributor.author
Ortiz Contreras, Jovita
Admission date
dc.date.accessioned
2018-06-18T15:22:19Z
Available date
dc.date.available
2018-06-18T15:22:19Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
Publichealth 147 ( 2017 ) 39 - 46
es_ES
Identifier
dc.identifier.other
http://dx.doi.org/10.1016/j.puhe.2017.01.027
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/148961
Abstract
dc.description.abstract
Objectives: Chile is a post-transitional country evolving towards a stationary population
pyramid, which may be associated with increasing preterm birth (PTB) rates. This study
aimed to compare maternal sociodemographic characteristics between the start of the
post-transition phase (1994) and an established stage (2013) and to evaluate associations
between these characteristics and PTB.
Study design: An observational analytic design was conducted using national birth records
(n ¼ 4,956,311).
Methods: Variables analysed in the 20 birth cohorts from 1994 to 2013 were: length of
gestation (preterm <37 weeks) subdivided by gestational age (extreme, moderate/severe
and late); maternal age ( 19, 20e35 and >35 years); education level (<8, 8e12 and >12 years
of education); employment; marital status; area of residence; and type of birth (singleton,
twins, and triplets or higher order). The prevalence of PTB was expressed as a percentage,
and associations between PTB and predictor variables were analysed using logistic
regression models.
Results: Education level, age >35 years, maternal employment, unmarried status, twin
delivery and urban residency rates increased between 1994 and 2013. According to the
adjusted models, age >35 years and delivery of more than two foetuses were risk factors for
all PTB subtypes. Maternal employment was a risk factor for moderate/severe, late and
total PTB, and a low level of education was a risk factor for late and total PTB. On the other
hand, age 19 years was protective against all PTB subtypes.
Conclusions: All maternal characteristics changed between 1994 and 2013. Furthermore, the
prevalence of PTB increased for all predictor variables studied over this period.
Association between preterm birth and its subtypes and maternal sociodemographic characteristics during the post transitional phase in a developing country with a very high human development index