Jennifer J Yland1, Holly M Crowe2, Elizabeth E Hatch2, Sydney K Willis2, Tanran R Wang2, Ellen M Mikkelsen3, David A Savitz4, Allan J Walkey5, Kenneth J Rothman6, Lauren A Wise2. 1. Department of Epidemiology, Boston University School of Public Health, Boston, MA. Electronic address: yland@bu.edu. 2. Department of Epidemiology, Boston University School of Public Health, Boston, MA. 3. Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Aarhus, Denmark. 4. Department of Epidemiology, Brown University School of Public Health, Providence, RI. 5. Boston University School of Medicine, Boston, MA. 6. Department of Epidemiology, Boston University School of Public Health, Boston, MA; RTI Health Solutions, Research Triangle Park, NC.
Abstract
PURPOSE: To evaluate the relationships among history of asthma, asthma severity, and spontaneous abortion (SAB). METHODS: Pregnancy Study Online is a preconception cohort study of North American couples. During the preconception period, female participants reported their history of physician-diagnosed asthma, age at first diagnosis, and use of asthma medications in the previous 4 weeks. Asthma severity was classified by medication use proximal to conception, from level 0 to 3 in increasing severity. Pregnancy and SAB were identified using data from follow-up questionnaires. We estimated hazard ratios (HRs) and 95% confidence intervals (CIs). RESULTS: Among 6325 participants who conceived, 19% experienced SAB and 17% reported a history of asthma. There was no appreciable association between asthma history and SAB incidence (HR = 0.98; 95% CI: 0.84, 1.14). HRs comparing severity levels 0, 1, and 2-3 with no asthma were 0.82 (95% CI: 0.67, 1.01), 1.20 (95% CI: 0.91, 1.60), and 1.31 (95% CI: 0.97, 1.78), respectively. Among women who conceived without the use of fertility treatment, level 2-3 severity was associated with SAB (HR = 1.39; 95% CI: 1.02, 1.89). CONCLUSIONS: While history of asthma diagnosis was not materially associated with SAB, having severe asthma (based on medication use) was associated with greater SAB risk.
PURPOSE: To evaluate the relationships among history of asthma, asthma severity, and spontaneous abortion (SAB). METHODS: Pregnancy Study Online is a preconception cohort study of North American couples. During the preconception period, female participants reported their history of physician-diagnosed asthma, age at first diagnosis, and use of asthma medications in the previous 4 weeks. Asthma severity was classified by medication use proximal to conception, from level 0 to 3 in increasing severity. Pregnancy and SAB were identified using data from follow-up questionnaires. We estimated hazard ratios (HRs) and 95% confidence intervals (CIs). RESULTS: Among 6325 participants who conceived, 19% experienced SAB and 17% reported a history of asthma. There was no appreciable association between asthma history and SAB incidence (HR = 0.98; 95% CI: 0.84, 1.14). HRs comparing severity levels 0, 1, and 2-3 with no asthma were 0.82 (95% CI: 0.67, 1.01), 1.20 (95% CI: 0.91, 1.60), and 1.31 (95% CI: 0.97, 1.78), respectively. Among women who conceived without the use of fertility treatment, level 2-3 severity was associated with SAB (HR = 1.39; 95% CI: 1.02, 1.89). CONCLUSIONS: While history of asthma diagnosis was not materially associated with SAB, having severe asthma (based on medication use) was associated with greater SAB risk.
Authors: B E Ainsworth; W L Haskell; M C Whitt; M L Irwin; A M Swartz; S J Strath; W L O'Brien; D R Bassett; K H Schmitz; P O Emplaincourt; D R Jacobs; A S Leon Journal: Med Sci Sports Exerc Date: 2000-09 Impact factor: 5.411
Authors: Jennifer J Yland; Brian T Bateman; Krista F Huybrechts; Gregory Brill; Michael X Schatz; Keele E Wurst; Sonia Hernández-Díaz Journal: J Allergy Clin Immunol Pract Date: 2020-01-22
Authors: Laila J Tata; Sarah A Lewis; Tricia M McKeever; Chris J P Smith; Pat Doyle; Liam Smeeth; Joe West; Richard B Hubbard Journal: Am J Respir Crit Care Med Date: 2007-02-01 Impact factor: 21.405