Risk of birth defects by pregestational type 1 or type 2 diabetes: National Birth Defects Prevention Study, 1997-2011

Stephanie L Marchincin1, Meredith M Howley1, Alissa R Van Zutphen1,2

  • 1Birth Defects Registry, New York State Department of Health, Albany, New York, USA.

Insights

Pregestational diabetes, both type 1 (PGD1) and type 2 (PGD2), is linked to numerous birth defects across all body systems. Improved glycemic control is crucial for preventing these adverse pregnancy outcomes.

Area of Science:

  • Reproductive Health
  • Pediatrics
  • Endocrinology

Background:

  • Existing research indicates a correlation between pregestational diabetes and birth defects.
  • Distinct biological pathways for type 1 (PGD1) and type 2 (PGD2) diabetes necessitate separate analyses of their association with birth defects.

Purpose of the Study:

  • To investigate and quantify the association between PGD1 and PGD2 and specific birth defects.
  • To differentiate the risks associated with PGD1 versus PGD2 for various congenital anomalies.

Main Methods:

  • Utilized data from the National Birth Defects Prevention Study (NBDPS) spanning October 1997 to December 2011.
  • Compared self-reported PGD1 and PGD2 in 29,024 birth defect cases and 10,898 live-born controls.
  • Calculated adjusted odds ratios (aORs) and confidence intervals (CIs) for associations, employing Firth's penalized likelihood for small case groups.

Main Results:

  • PGD1 was associated with 22 out of 26 examined defects, and PGD2 with 29 out of 39.
  • Elevated aORs were observed for both PGD1 (1.6-70.4) and PGD2 (1.6-59.9) across all evaluated body systems.
  • Sacral agenesis showed the strongest associations for both PGD1 (aOR: 70.4) and PGD2 (aOR: 59.9).

Conclusions:

  • Both PGD1 and PGD2 demonstrate significant positive associations with a wide range of birth defects.
  • Findings underscore the importance of glycemic control in mitigating birth defect risks for pregnancies affected by diabetes.
  • Further research into glycemic control's role is recommended for effective prevention strategies.
Abstract

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