Socioeconomic position and the risk of preterm birth—a study within the Danish National Birth Cohort

Background Low socioeconomic position is generally associated with increased risk of preterm birth, but it remains unclear whether the inequality depends on the socioeconomic measure used, if the associations differ according to the degree of prematurity, and how individual level risk factors mediat...

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Bibliographic Details
Published in:International journal of epidemiology 2008-10, Vol.37 (5), p.1109-1120
Main Authors: Morgen, Camilla Schmidt, Bjørk, Christina, Andersen, Per Kragh, Mortensen, Laust Hvas, Nybo Andersen, Anne-Marie
Format: Article
Language:English
Subjects:
Age Factors
Biological and medical sciences
Chronic Disease
Diseases of mother, fetus and pregnancy
Educational Status
Female
Gestational Age
Gynecology. Andrology. Obstetrics
Humans
Infant, Newborn
Medical sciences
Miscellaneous
obstetrics
Parity
Poverty
Pregnancy
Pregnancy. Fetus. Placenta
Premature Birth
Premature labour
Proportional Hazards Models
Public health. Hygiene
Public health. Hygiene-occupational medicine
Risk
Risk Factors
Smoking
Socioeconomic Factors
socioeconomic position
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Summary:Background Low socioeconomic position is generally associated with increased risk of preterm birth, but it remains unclear whether the inequality depends on the socioeconomic measure used, if the associations differ according to the degree of prematurity, and how individual level risk factors mediate the association. Methods The hazard ratios (HR) of preterm birth associated with five different measures of socioeconomic position and three degrees of preterm birth were analysed in a dataset of 75 890 singleton pregnancies (1996–2002) from the Danish National Birth Cohort. This, and the mediating role of selected individual level risk factors (smoking, alcohol consumption, binge drinking, pre-pregnancy body mass index, gestational weight gain) were estimated, using Cox regression analyses. Results Mothers with 12 years of education and the association interacted with parity, while income and occupation affected the risk to a lesser degree. The adjusted HR for less educated nulliparous and parous women were 1.22 (95% CI 1.04–1.42) and 1.56 (95% CI 1.31–1.87), respectively, compared with women with >12 years of education. For parous women with
ISSN:0300-5771
1464-3685
DOI:10.1093/ije/dyn112