References
- Kilpatrick SK, Ecker JL, American College of Obstetricians and Gynecologists and the Society for Maternal–Fetal Medicine, et al. Severe maternal morbidity: screening and review. Am J Obstet Gynecol. 2016;215(3):B17–B22.
- Rivara FP, Fihn SD. Severe maternal morbidity and mortality: JAMA network open call for papers. JAMA Netw Open. 2020;3(1):e200045.
- Callaghan WM, Creanga AA, Kuklina EV. Severe maternal morbidity among delivery and postpartum hospitalizations in the United States. Obstet Gynecol. 2012;120(5):1029–1036.
- CDC. Severe maternal morbidity in the United States. [cited 2021 Apr 19]. Available from: https://www.cdc.gov/reproductivehealth/maternalinfanthealth/severematernalmorbidity.html
- Mathews TJ, Hamilton BE. Mean age of mothers is on the rise: United States, 2000–2014. NCHS Data Brief. 2016;(232):1–8.
- Flegal KM, Carroll MD, Ogden CL, et al. Prevalence and trends in obesity among US adults, 1999–2008. JAMA. 2010;303(3):235–241.
- Fisher S, Kim S, Sharma A, et al. Is obesity still increasing among pregnant women? Prepregnancy obesity trends in 20 states, 2003–2009. Prev Med. 2013;56(6):372–378.
- Small MJ, James AH, Kershaw T, et al. Near-miss maternal mortality: cardiac dysfunction as the principal cause of obstetric intensive care unit admissions. Obstet Gynecol. 2012;119(2 Pt 1):250–255.
- Campbell KH, Savitz D, Werner EF, et al. Maternal morbidity and risk of death at delivery hospitalization. Obstet Gynecol. 2013;122(3):627–633.
- CDC. Severe morbidity indicators and corresponding ICD-9-CM/ICD-10-CM/PCS codes during delivery hospitalizations. [cited 2021 Apr 19]. Available from: https://www.cdc.gov/reproductivehealth/maternalinfanthealth/smm/severe-morbidity-ICD.htm.
- Korst LM, Gregory KD, Nicholas LA, et al. A scoping review of severe maternal morbidity: describing risk factors and methodological approaches to inform population-based surveillance. Matern Health Neonatol and Perinatol. 2021;7(1):1–20.
- Creanga AA, Bateman BT, Kuklina EV, et al. Racial and ethnic disparities in severe maternal morbidity: a multistate analysis, 2008–2010. Am J Obstetr Gynecol. 2014;210(5):435.e1–435.e8.
- Mhyre JM, Bateman BT, Leffert LR. Influence of patient comorbidities on the risk of near-miss maternal morbidity or mortality. J Am Soc Anesthesiol. 2011;115(5):963–972.
- Malone FD, Kaufman GE, Chelmow D, et al. Maternal morbidity associated with triplet pregnancy. Am J Perinatol. 1998;15(1):73–77.
- Gray KE, Wallace ER, Nelson KR, et al. Population‐based study of risk factors for severe maternal morbidity. Paediatr Perinat Epidemiol. 2012;26(6):506–514.
- Brown CC, Adams CE, George KE, et al. Associations between comorbidities and severe maternal morbidity. Obstet Gynecol. 2020;136(5):892–901.
- Bateman BT, Mhyre JM, Hernandez-Diaz S, et al. Development of a comorbidity index for use in obstetric patients. Obstetr Gynecol. 2013;122(5):957–965.
- Leonard SA, Kennedy CJ, Carmichael SL, et al. An expanded obstetric comorbidity scoring system for predicting severe maternal morbidity. Obstet Gynecol. 2020;136(3):440–449.
- Howell EA, Egorova NN, Janevic T, et al. Severe maternal morbidity among Hispanic women in New York City: investigation of health disparities. Obstet Gynecol. 2017;129(2):285–294.
- Admon LK, Winkelman TN, Zivin K, et al. Racial and ethnic disparities in the incidence of severe maternal morbidity in the United States, 2012–2015. Obstet Gynecol. 2018;132(5):1158–1166.
- Lisonkova S, Haslam MD, Dahlgren L, et al. Maternal morbidity and perinatal outcomes among women in rural versus urban areas. CMAJ. 2016;188(17–18):E456–E465.
- Admon LK, Dalton VK, Kolenic GE, et al. Comparison of delivery-related, early and late postpartum severe maternal morbidity among individuals with commercial insurance in the US, 2016 to 2017. JAMA Netw Open. 2021;4(12):e2137716.
- America’s Health Rankings. Health of women and children report. 2019 [cited 2021 Apr 19]. Available from: https://www.americashealthrankings.org/learn/reports/2019-health-of-women-and-children-report.
- USDA. State data. [cited 2021 Apr 19]. Available from https://data.ers.usda.gov/reports.aspx?StateFIPS=05&StateName=Arkansas&ID=17854
- Arkansas Department of Human Services. Arkansas medicaid program overview SFY. 2013 [cited 2022 Dec 15]. Available from: https://humanservices.arkansas.gov/wp-content/uploads/Medicaid_Program_Overview_SFY2013.pdf
- Arkansas Department of Human Services. Arkansas medicaid program overview SFY. 2014 [cited 2022 Dec 15]. Available from: https://humanservices.arkansas.gov/wp-content/uploads/Medicaid_Program_Overview_SFY2014.pdf.
- Arkansas Department of Human Services. Arkansas medicaid program overview SFY. 2015 [cited 2022 Dec 15]. Available from: https://humanservices.arkansas.gov/wp-content/uploads/Medicaid_Program_Overview_SFY2015.pdf.
- Arkansas Department of Human Services. Arkansas medicaid program overview SFY. 2016 [cited 2022 Dec 15]. Available from: https://humanservices.arkansas.gov/wp-content/uploads/Medicaid_Program_Overview_SFY2016.pdf.
- Bronstein JM, Lomatsch CT, Fletcher D, et al. Issues and biases in matching medicaid pregnancy episodes to vital records data: the Arkansas experience. Matern Child Health J. 2009;13(2):250–259.
- Metcalfe A, Lix L, Johnson JA, et al. Validation of an obstetric comorbidity index in an external population. BJOG: int J Obstet Gy. 2015;122(13):1748–1755.
- USDA. United States Department of Agriculture Economic Research Service. Rural Urban Continuum Codes (RUCC). [cited 2022 Nov 9]. Available from: https://www.ers.usda.gov/data-products/rural-urban-continuum-codes/
- HRSA. Health Resources and Services Administration. Department of Health & Human Services. Area Helath Resources Files. [cited 2022 Nov 9]. Available from: https://data.hrsa.gov/topics/health-workforce/ahrf.
- Firth D. Bias reduction of maximum likelihood estimates. Biometrika. 1993;80(1):27–38.
- Drummond C, Holte RC, editors. C4. 5, class imbalance, and cost sensitivity: why under-sampling beats over-sampling. Workshop on learning from imbalanced datasets II. Washington (DC): Citeseer; 2003.
- Mani I, Zhang I, editors. kNN approach to unbalanced data distributions: a case study involving information extraction. Proceedings of workshop on learning from imbalanced datasets. Washington (DC): ICML United States; 2003.
- Wang H, editor. Logistic regression for massive data with rare events. Online: International Conference on Machine Learning; 2020. PMLR.
- Pinker E. Reporting accuracy of rare event classifiers. NPJ Digital Med. 2018;1(1):1–2.
- Bennett KJ, Borders TF, Holmes GM, et al. What is rural? Challenges and implications of definitions that inadequately encompass rural people and places. Health Aff (Millwood). 2019;38(12):1985–1992.
- Long JC, Delamater PL, Holmes GM. Which definition of rurality should I use?: The relative performance of 8 federal rural definitions in identifying rural-urban disparities. Med Care. 2021;59(Suppl 5):S413–S419.
- Kozhimannil KB, Interrante JD, Henning-Smith C, et al. Rural-urban differences in severe maternal morbidity and mortality in the US, 2007–15. Health Aff (Millwood). 2019;38(12):2077–2085.
- US Office of Management and Budget. 2013. Rural-urban continuum codes. [cited 2022 Dec 15]. Available from: https://www.ers.usda.gov/data-products/rural-urban-continuum-codes.aspx.
- Salahuddin M, Mandell DJ, Lakey DL, et al. Maternal comorbidity index and severe maternal morbidity during delivery hospitalizations in Texas, 2011–2014. Birth. 2020;47(1):89–97.
- Easter SR, Bateman BT, Sweeney VH, et al. A comorbidity-based screening tool to predict severe maternal morbidity at the time of delivery. Am J Obstetr Gynecol. 2019;221(3):271.e1–271.e10.
- Main EK, Leonard SA, Menard MK. Association of maternal comorbidity with severe maternal morbidity: a cohort study of California mothers delivering between 1997 and 2014. Ann Intern Med. 2020;173(11 Suppl):S11–S18.
- Hehir MP, Ananth CV, Wright JD, et al. Severe maternal morbidity and comorbid risk in hospitals performing< 1000 deliveries per year. Am J Obstetr Gynecol. 2017;216(2):179.e1–179.e12.
- Danilack VA, Nunes AP, Phipps MG. Unexpected complications of low-risk pregnancies in the United States. Am J Obstetr Gynecol. 2015;212(6):809.e1–809.e6.
- Metcalfe A, Sheikh M, Hetherington E. Impact of the ICD-9-CM to ICD-10-CM transition on the incidence of severe maternal morbidity among delivery hospitalizations in the United States. Am J Obstetr Gynecol. 2021;225(4):422.e1–422.e11.