Trends and racial and ethnic disparities in the prevalence of pregestational type 1 and type 2 diabetes in Northern California: 1996-2014
Open accessAbstract
Background Despite concern for adverse perinatal outcomes in women with diabetes mellitus before pregnancy, recent data on the prevalence of pregestational type 1 and type 2 diabetes mellitus in the United States are lacking.Objective The purpose of this study was to estimate changes in the prevalence of overall pregestational diabetes mellitus (all types) and pregestational type 1 and type 2 diabetes mellitus and to estimate whether changes varied by race-ethnicity from 1996-2014.Study design We conducted a cohort study among 655,428 pregnancies at a Northern California integrated health delivery system from 1996-2014. Logistic regression analyses provided estimates of prevalence and trends.Results The age-adjusted prevalence (per 100 deliveries) of overall pregestational diabetes mellitus increased from 1996-1999 to 2012-2014 (from 0.58 [95% confidence interval, 0.54-0.63] to 1.06 [95% confidence interval, 1.00-1.12]; P trend <.0001). Significant increases occurred in all racial-ethnic groups; the largest relative increase was among Hispanic women (121.8% [95% confidence interval, 84.4-166.7]); the smallest relative increase was among non-Hispanic white women (49.6% [95% confidence interval, 27.5-75.4]). The age-adjusted prevalence of pregestational type 1 and type 2 diabetes mellitus increased from 0.14 (95% confidence interval, 0.12-0.16) to 0.23 (95% confidence interval, 0.21-0.27; P trend <.0001) and from 0.42 (95% confidence interval, 0.38-0.46) to 0.78 (95% confidence interval, 0.73-0.83; P trend <.0001), respectively. The greatest relative increase in the prevalence of type 1 diabetes mellitus was in non-Hispanic white women (118.4% [95% confidence interval, 70.0-180.5]), who had the lowest increases in the prevalence of type 2 diabetes mellitus (13.6% [95% confidence interval, -8.0 to 40.1]). The greatest relative increase in the prevalence of type 2 diabetes mellitus was in Hispanic women (125.2% [95% confidence interval, 84.8-174.4]), followed by African American women (102.0% [95% confidence interval, 38.3-194.3]) and Asian women (93.3% [95% confidence interval, 48.9-150.9]).Conclusions The prevalence of overall pregestational diabetes mellitus and pregestational type 1 and type 2 diabetes mellitus increased from 1996-1999 to 2012-2014 and racial-ethnic disparities were observed, possibly because of differing prevalence of maternal obesity. Targeted prevention efforts, preconception care, and disease management strategies are needed to reduce the burden of diabetes mellitus and its sequelae.
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The ongoing epidemic of obesity and diabetes has led to more type 2 diabetes in people of reproductive age, with an increase in pregnant individuals with undiagnosed type 2 diabetes in early pregnancy.
“The ongoing epidemic of obesity and diabetes has led to more type 2 diabetes in people of reproductive age, with an increase in the number of pregnant individuals with undiagnosed type 2 diabetes in early pregnancy (179 -181).”
From 2. Diagnosis and Classification of Diabetes: <i>Standards of Care in Diabetes—2024</i> (2024) · cites this paper as [180]
The Comments section reports rising pregestational type 2 diabetes and suggests that increasing obesity among women of reproductive age likely contributed. But the Materials and Methods section says the study counted diabetes clinically recognized before pregnancy; it does not establish an increase in pregnant individuals with undiagnosed type 2 diabetes in early pregnancy. Page numbers are unavailable in our copy. (LLM, conf=0.89)
Experimental — accuracy not yet measuredThe ongoing epidemic of obesity and diabetes has led to more type 2 diabetes in people of reproductive age, with an increase in the number of pregnant individuals with undiagnosed type 2 diabetes in early pregnancy.
“The ongoing epidemic of obesity and diabetes has led to more type 2 diabetes in people of reproductive age, with an increase in the number of pregnant individuals with undiagnosed type 2 diabetes in early pregnancy (164-166).”
From 2. Diagnosis and classification of diabetes: standards of care in diabetes-2025 (2025) · cites this paper as [165]
The Comments report increasing pregestational type 2 diabetes and suggest that rising obesity among women of reproductive age likely contributed. But Materials and Methods says the study identified diabetes clinically recognized before pregnancy; it does not establish an increase in undiagnosed type 2 diabetes in early pregnancy. Page numbers are unavailable in our copy. (LLM, conf=0.88)
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Preconception care in diabetes: Predisposing factors and barriers
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Oral feeding challenges of infants of diabetic mothers
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Care of Infants Born to Women with Diabetes
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Caring for pregnant women whose diabetes antedates pregnancy: is there room for improvement?
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Prospects of using cystatin c as an early predictor of diabetic nephropathy
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Maternal Diabetes and Infant Sex Ratio
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Risk Factors and Prevention Strategies for Gestational Diabetes in Asian Populations
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Risk of Congenital Anomalies in Pregnant Women with Type 2 Diabetes
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Chicago Neighborhood Context and Racial/Ethnic Disparities in Maternal Diabetes
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Pregnancy and Diabetes Racial/Ethnicity Health Disparities in a Large Integrated Health System
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Gestasyonel Diabetes Mellitusun Önlenmesi ve Yönetiminde Tıbbi Beslenme Tedavisinin Önemi
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PROGRESSION, TREATMENT, AND OUTCOMES OF RETINAL VASCULAR DISEASES IN PREGNANCY
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A Retrospective, Cross-Sectional Study of Geographic Food Environment and Diabetes in Pregnancy
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Delayed Access to Insulin During Pregnancy
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- Authors
- Peng, T. Y., Ehrlich, S. F., Crites, Y., Kitzmiller, J. L., Kuzniewicz, M. W., Hedderson, M. M., & Ferrara, A.
- Affiliations
- Kaiser Permanente (US)
- Santa Clara Valley Medical Center (US)
- Corresponding author
- Ferrara, Assiamira
- Venue
- American Journal of Obstetrics and Gynecology
- Publisher
- Elsevier BV
- Published
- 2017-02
- Volume
- 216
- Issue
- 2
- Pages
- 177.e1-177.e8
- ISSN
- 0002-9378 (ISSN-L)
- PMC
- PMC5290002
- OpenAlex
- W2536874336
- Cited by
- 94
- References
- 31
- Citations by year
- 2026: 2 · 2025: 12 · 2024: 9 · 2023: 11 · 2022: 11 · 2021: 15 · 2020: 12 · 2019: 3 · 2018: 16 · 2017: 3
- FWCI
- 9.47
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- American Journal of Obstetrics and Gynecology (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Institute of Diabetes and Digestive and Kidney Diseases (K01DK105106, P30DK092924)
- Topics
- Health Sciences › Medicine › Obstetrics and Gynecology › Gestational Diabetes Research and Management
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Keywords
- pregestational diabetes, type 1 diabetes, type 2 diabetes, diabetes prevalence trends, racial and ethnic disparities, Hispanic women, non-Hispanic white women, Northern California, perinatal outcomes, gestational diabetes screening, health equity
- MeSH terms
- Adult, Asian, Black or African American, California, Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2, Ethnicity, Female, Hispanic or Latino, Humans, Obesity, Pregnancy, Pregnancy Complications, Pregnancy in Diabetics, Cohort Studies, Prevalence, Logistic Models, White People, Health Status Disparities, Young Adult
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