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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.
Background:
Previous studies found consistent associations between pregestational diabetes and birth defects. Given the different biological mechanisms for type 1 (PGD1) and type 2 (PGD2) diabetes, we used National Birth Defects Prevention Study (NBDPS) data to estimate associations by diabetes type.
Methods:
The NBDPS was a study of major birth defects that included pregnancies with estimated delivery dates from October 1997 to December 2011. We compared self-reported PGD1 and PGD2 for 29,024 birth defect cases and 10,898 live-born controls. For case groups with ≥5 exposed cases, we estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) for the association between specific defects and each diabetes type. We calculated crude ORs (cORs) and 95% CIs with Firth's penalized likelihood for case groups with 3-4 exposed cases.
Results:
Overall, 252 (0.9%) cases and 24 (0.2%) control mothers reported PGD1, and 357 (1.2%) cases and 34 (0.3%) control mothers reported PGD2. PGD1 was associated with 22/26 defects examined and PGD2 was associated with 29/39 defects examined. Adjusted ORs ranged from 1.6 to 70.4 for PGD1 and from 1.6 to 59.9 for PGD2. We observed the strongest aORs for sacral agenesis (PGD1: 70.4, 32.3-147; PGD2: 59.9, 25.4-135). For both PGD1 and PGD2, we observed elevated aORs in every body system we evaluated, including central nervous system, orofacial, eye, genitourinary, gastrointestinal, musculoskeletal, and cardiac defects.
Conclusions:
We observed positive associations between both PGD1 and PGD2 and birth defects across multiple body systems. Future studies should focus on the role of glycemic control in birth defect risk to inform prevention efforts.
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