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Association between very advanced maternal age and adverse pregnancy outcomes: a cross sectional Japanese study

Overview of attention for article published in BMC Pregnancy and Childbirth, October 2017
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About this Attention Score

  • In the top 25% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (82nd percentile)
  • Good Attention Score compared to outputs of the same age and source (73rd percentile)

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1 news outlet
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1 Facebook page

Citations

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112 Dimensions

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240 Mendeley
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Title
Association between very advanced maternal age and adverse pregnancy outcomes: a cross sectional Japanese study
Published in
BMC Pregnancy and Childbirth, October 2017
DOI 10.1186/s12884-017-1540-0
Pubmed ID
Authors

Kohei Ogawa, Kevin Y. Urayama, Shinji Tanigaki, Haruhiko Sago, Shoji Sato, Shigeru Saito, Naho Morisaki

Abstract

While several studies have demonstrated the increased risk of pregnancy complications for women of advanced age, few studies have focused on women with very advanced age (≥ 45), despite the increasing rate of pregnancy among such women. Furthermore, how such risks of increase in age differ by maternal characteristics are also poorly understood. Thus, we aimed to clarify pregnant outcomes among women with very advanced age and how the effect of age differs by method of conception and parity. We used the national multicenter Japan Society of Obstetrics and Gynecology perinatal database, including 365,417 women aged 30 years or older who delivered a singleton between 2005 and 2011. We divided women into four groups based on age (years): 30-34, 35-39, 40-44, and ≥45, and compared risk of adverse birth outcomes between the groups using Poisson regression. Effect modification by parity and use of assisted reproductive technology (ART) was also evaluated. Compared with women aged 30-34 years, women aged 45 or older had higher risk of emergency cesarean delivery [adjusted risk ratio (aRR): 1.77, 95% confidence interval (95% CI): 1.58-1.99], preeclampsia (aRR: 1.86, 95% CI: 1.43-2.42), severe preeclampsia (aRR: 2.03, 95% CI: 1.31-3.13), placenta previa (aRR: 2.17, 95% CI: 1.60-2.95), and preterm birth (aRR: 1.20, 95% CI: 1.04-1.39). The effect of older age on risk of emergency cesarean section, preeclampsia, and preterm birth were significantly greater among those who conceived naturally compared to those who conceived by ART. The effect on emergency cesarean section was stronger among primiparous women, whereas the risk of preeclampsia associated with older age was significantly greater among multiparous women. Very advanced maternal age (≥ 45) was related to greater risk for adverse birth outcomes compared to younger women, especially for maternal complications including cesarean section, preeclampsia, severe preeclampsia, and placenta previa. The magnitude of the influence of age also differed by conception method and by parity.

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X Demographics

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Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 240 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 240 100%

Demographic breakdown

Readers by professional status Count As %
Student > Bachelor 34 14%
Student > Master 30 13%
Researcher 19 8%
Student > Doctoral Student 18 8%
Student > Postgraduate 15 6%
Other 40 17%
Unknown 84 35%
Readers by discipline Count As %
Medicine and Dentistry 75 31%
Nursing and Health Professions 44 18%
Biochemistry, Genetics and Molecular Biology 6 3%
Social Sciences 6 3%
Agricultural and Biological Sciences 5 2%
Other 13 5%
Unknown 91 38%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 11. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 10 September 2019.
All research outputs
#3,298,312
of 25,769,258 outputs
Outputs from BMC Pregnancy and Childbirth
#899
of 4,855 outputs
Outputs of similar age
#58,603
of 335,774 outputs
Outputs of similar age from BMC Pregnancy and Childbirth
#26
of 97 outputs
Altmetric has tracked 25,769,258 research outputs across all sources so far. Compared to these this one has done well and is in the 87th percentile: it's in the top 25% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 4,855 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 9.3. This one has done well, scoring higher than 81% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 335,774 tracked outputs that were published within six weeks on either side of this one in any source. This one has done well, scoring higher than 82% of its contemporaries.
We're also able to compare this research output to 97 others from the same source and published within six weeks on either side of this one. This one has gotten more attention than average, scoring higher than 73% of its contemporaries.