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The associations between bridal pregnancy and obstetric outcomes among live births in Korea: population-based study.

Lee JY, Park JS, Jun JK, Shin SH, Ko YJ, Park SM - PLoS ONE (2014)

Bottom Line: In the study population, the pregnancy outcomes among live births from the bridal pregnancy group (N = 62,590) were compared with the outcomes of the post-marital pregnancy group (N = 564,749), composed of women who gave birth after 10 months but before 24 months of marriage.The socio-demographic factors among the bridal pregnancy group were associated with a social disadvantage and particular risk factors.Pregnancy outcomes among live births from bridal pregnancies are associated with higher risks for PTB and LBW in Korea.

View Article: PubMed Central - PubMed

Affiliation: Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.

ABSTRACT

Objective: In East Asia the recently increased number of marriages in response to pregnancy is an important social issue. This study evaluated the association of marriage preceded by pregnancy (bridal pregnancy) with obstetric outcomes among live births in Korea.

Methods: In this population-based study, 1,152,593 first singleton births were evaluated from data registered in the national birth registration database from 2004 to 2008 in Korea. In the study population, the pregnancy outcomes among live births from the bridal pregnancy group (N = 62,590) were compared with the outcomes of the post-marital pregnancy group (N = 564,749), composed of women who gave birth after 10 months but before 24 months of marriage. The variables preterm birth (PTB; <37 weeks gestation) and low birth weight (LBW; <2.5 kg) were used to determine the primary outcome. The adjusted odds ratios (aORs) and 95% confidence intervals (CIs) were calculated after controlling for socio-demographic factors.

Results: The socio-demographic factors among the bridal pregnancy group were associated with a social disadvantage and particular risk factors. In the subgroup analyses of maternal age, differences in adverse pregnancy outcomes from bridal pregnancy were identified between women in the following age group: (i) ≤19, (ii) 20-39, and (iii) ≥40 years. After the multivariate analysis, the aORs for each age group were 1.47 (95% CI: 1.15-1.89), 1.76 (1.70-1.83), and 1.13 (0.77-1.66), respectively, for PTB and 0.92 (0.70-1.21), 1.60 (1.53-1.66), and 1.11 (0.71-1.74), respectively, for LBW. In the adjusted logistic regression models, bridal pregnancy was associated with PTB (1.76, 1.69-1.82) and LBW (1.53, 1.48-1.59).

Conclusion: Pregnancy outcomes among live births from bridal pregnancies are associated with higher risks for PTB and LBW in Korea.

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Related in: MedlinePlus

Flow diagrams depicting the selection of the study population.
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pone-0103178-g001: Flow diagrams depicting the selection of the study population.

Mentions: Data on 2,315,026 births between 2004 and 2008 were obtained from the NBR database. Figure 1 depicts the model used to select our study population. We excluded second and greater birth order infants (N = 1,117,041) because most premarital pregnancies are related to first birth order infants. Multiple births and post-term pregnancies (greater than 42 completed weeks of gestation) were also excluded. Marital status was registered in approximately all cases, and those who were unmarried or had unchecked data were excluded (N = 13,082). Data from birth weights <500 g were also excluded because a birth weight of 500 g is in the zone where infant resuscitation is not clear. Finally, we selected 1,152,593 births for the study population.


The associations between bridal pregnancy and obstetric outcomes among live births in Korea: population-based study.

Lee JY, Park JS, Jun JK, Shin SH, Ko YJ, Park SM - PLoS ONE (2014)

Flow diagrams depicting the selection of the study population.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4126680&req=5

pone-0103178-g001: Flow diagrams depicting the selection of the study population.
Mentions: Data on 2,315,026 births between 2004 and 2008 were obtained from the NBR database. Figure 1 depicts the model used to select our study population. We excluded second and greater birth order infants (N = 1,117,041) because most premarital pregnancies are related to first birth order infants. Multiple births and post-term pregnancies (greater than 42 completed weeks of gestation) were also excluded. Marital status was registered in approximately all cases, and those who were unmarried or had unchecked data were excluded (N = 13,082). Data from birth weights <500 g were also excluded because a birth weight of 500 g is in the zone where infant resuscitation is not clear. Finally, we selected 1,152,593 births for the study population.

Bottom Line: In the study population, the pregnancy outcomes among live births from the bridal pregnancy group (N = 62,590) were compared with the outcomes of the post-marital pregnancy group (N = 564,749), composed of women who gave birth after 10 months but before 24 months of marriage.The socio-demographic factors among the bridal pregnancy group were associated with a social disadvantage and particular risk factors.Pregnancy outcomes among live births from bridal pregnancies are associated with higher risks for PTB and LBW in Korea.

View Article: PubMed Central - PubMed

Affiliation: Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul, Korea.

ABSTRACT

Objective: In East Asia the recently increased number of marriages in response to pregnancy is an important social issue. This study evaluated the association of marriage preceded by pregnancy (bridal pregnancy) with obstetric outcomes among live births in Korea.

Methods: In this population-based study, 1,152,593 first singleton births were evaluated from data registered in the national birth registration database from 2004 to 2008 in Korea. In the study population, the pregnancy outcomes among live births from the bridal pregnancy group (N = 62,590) were compared with the outcomes of the post-marital pregnancy group (N = 564,749), composed of women who gave birth after 10 months but before 24 months of marriage. The variables preterm birth (PTB; <37 weeks gestation) and low birth weight (LBW; <2.5 kg) were used to determine the primary outcome. The adjusted odds ratios (aORs) and 95% confidence intervals (CIs) were calculated after controlling for socio-demographic factors.

Results: The socio-demographic factors among the bridal pregnancy group were associated with a social disadvantage and particular risk factors. In the subgroup analyses of maternal age, differences in adverse pregnancy outcomes from bridal pregnancy were identified between women in the following age group: (i) ≤19, (ii) 20-39, and (iii) ≥40 years. After the multivariate analysis, the aORs for each age group were 1.47 (95% CI: 1.15-1.89), 1.76 (1.70-1.83), and 1.13 (0.77-1.66), respectively, for PTB and 0.92 (0.70-1.21), 1.60 (1.53-1.66), and 1.11 (0.71-1.74), respectively, for LBW. In the adjusted logistic regression models, bridal pregnancy was associated with PTB (1.76, 1.69-1.82) and LBW (1.53, 1.48-1.59).

Conclusion: Pregnancy outcomes among live births from bridal pregnancies are associated with higher risks for PTB and LBW in Korea.

Show MeSH
Related in: MedlinePlus