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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 illustrating the selection of the bridal pregnancy and post-marital pregnancy groups.1 Because we could not distinguish premature births from post-marital pregnancy during this period, we excluded childbirths occurring between 5 and 10 months after marriage. 2 After 24 months of marriage, a certain portion of pregnancy outcomes may be affected by infertility treatment. Thus, we excluded births after 24 months of marriage. 3 Bridal pregnancy was defined as childbirth occurring before 5 months of marriage and was categorized as premarital birth and premarital conception. 4 Premarital birth was defined as childbirth before marriage followed by a marriage that occurred <1 month after birth. 5 Premarital conception was defined as pregnancy conceived before marriage and ending after marriage. 6 Post-marital pregnancy was defined as childbirth occurring between 10 and 24 months after marriage.
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pone-0103178-g002: Flow diagrams illustrating the selection of the bridal pregnancy and post-marital pregnancy groups.1 Because we could not distinguish premature births from post-marital pregnancy during this period, we excluded childbirths occurring between 5 and 10 months after marriage. 2 After 24 months of marriage, a certain portion of pregnancy outcomes may be affected by infertility treatment. Thus, we excluded births after 24 months of marriage. 3 Bridal pregnancy was defined as childbirth occurring before 5 months of marriage and was categorized as premarital birth and premarital conception. 4 Premarital birth was defined as childbirth before marriage followed by a marriage that occurred <1 month after birth. 5 Premarital conception was defined as pregnancy conceived before marriage and ending after marriage. 6 Post-marital pregnancy was defined as childbirth occurring between 10 and 24 months after marriage.

Mentions: Figure 2 presents the process by which we chose the bridal pregnancy and post-marital pregnancy groups from the study population. We divided the study population into groups based on the timing of childbirth and marriage. Of the 1,152,593 individuals included, 269,274 infants were born before their parents had been married for 10 months and 883,319 infants were born after their parents had been married for at least 10 months. Bridal pregnancy (N = 62,590) was defined by excluding infants born between 5 and 10 months after marriage from those born before 10 months of marriage. Infants born between 5 and 10 months after marriage probably were most likely a mixed population of preterm births from the post-marital birth group and term births from the bridal pregnancy group. We could not identify whether premature births were conceived subsequent to marriage in that period, so we employed a very conservative definition of bridal pregnancy. Moreover, we divided bridal pregnancy into two categories, the premarital birth group and the premarital conception (but birth after marriage) group, based on the timing of childbirth. Premarital birth (N = 3,130) was defined as childbirth that occurred before marriage followed by a marriage that occurred after birth but before birth registration (<1 month from birth). Premarital conception (N = 59,460) was defined as a pregnancy conceived before marriage and ending after marriage.


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 illustrating the selection of the bridal pregnancy and post-marital pregnancy groups.1 Because we could not distinguish premature births from post-marital pregnancy during this period, we excluded childbirths occurring between 5 and 10 months after marriage. 2 After 24 months of marriage, a certain portion of pregnancy outcomes may be affected by infertility treatment. Thus, we excluded births after 24 months of marriage. 3 Bridal pregnancy was defined as childbirth occurring before 5 months of marriage and was categorized as premarital birth and premarital conception. 4 Premarital birth was defined as childbirth before marriage followed by a marriage that occurred <1 month after birth. 5 Premarital conception was defined as pregnancy conceived before marriage and ending after marriage. 6 Post-marital pregnancy was defined as childbirth occurring between 10 and 24 months after marriage.
© Copyright Policy
Related In: Results  -  Collection

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

pone-0103178-g002: Flow diagrams illustrating the selection of the bridal pregnancy and post-marital pregnancy groups.1 Because we could not distinguish premature births from post-marital pregnancy during this period, we excluded childbirths occurring between 5 and 10 months after marriage. 2 After 24 months of marriage, a certain portion of pregnancy outcomes may be affected by infertility treatment. Thus, we excluded births after 24 months of marriage. 3 Bridal pregnancy was defined as childbirth occurring before 5 months of marriage and was categorized as premarital birth and premarital conception. 4 Premarital birth was defined as childbirth before marriage followed by a marriage that occurred <1 month after birth. 5 Premarital conception was defined as pregnancy conceived before marriage and ending after marriage. 6 Post-marital pregnancy was defined as childbirth occurring between 10 and 24 months after marriage.
Mentions: Figure 2 presents the process by which we chose the bridal pregnancy and post-marital pregnancy groups from the study population. We divided the study population into groups based on the timing of childbirth and marriage. Of the 1,152,593 individuals included, 269,274 infants were born before their parents had been married for 10 months and 883,319 infants were born after their parents had been married for at least 10 months. Bridal pregnancy (N = 62,590) was defined by excluding infants born between 5 and 10 months after marriage from those born before 10 months of marriage. Infants born between 5 and 10 months after marriage probably were most likely a mixed population of preterm births from the post-marital birth group and term births from the bridal pregnancy group. We could not identify whether premature births were conceived subsequent to marriage in that period, so we employed a very conservative definition of bridal pregnancy. Moreover, we divided bridal pregnancy into two categories, the premarital birth group and the premarital conception (but birth after marriage) group, based on the timing of childbirth. Premarital birth (N = 3,130) was defined as childbirth that occurred before marriage followed by a marriage that occurred after birth but before birth registration (<1 month from birth). Premarital conception (N = 59,460) was defined as a pregnancy conceived before marriage and ending after marriage.

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