Quetzal Class

Quetzal Class, PhD

Research Assistant Professor of Obstetrics & Gynecology
Director, Resident Research Program

Academic Office:
Phone: (312) 996-7006
Fax: (312) 996-4238

Medical School Internship Post-Doctoral Scholar Undergraduate
Indiana University, Bloomington  Indiana University School of Medicine University of Chicago University of California, San Diego


Quetzal A. Class explores the causes and consequences of preconception, prenatal, and family-planning risk factors on offspring and maternal physical and psychological well-being. Her research has focused on preconception stress, adverse birth outcomes, interpregnancy interval, and maternal infection during pregnancy, primarily using large, longitudinal datasets. Dr. Class uses several advanced statistical and epidemiological methods, such as quasi-experimental approaches, family-based designs (e.g., the comparison of differentially exposed siblings or cousins), and structural equation modeling to pull-apart co-occurring risk mechanisms and test competing hypotheses. Dr. Class is also passionate about research education and very much enjoys mentoring residents as they develop their own research skills and interests.

Recent Publications

Cotangco, K., Class, Q.A., Johnson, T.P., Kothari, R. (2020) The change of life: Understanding and knowledge and attitudes regarding menopause and hormone replacement therapy in cervical cancer survivors. Menopause, 27(6), 701-705. DOI: 10.1097/GME.0000000000001520

Class Q.A. Maternal infection associated with autism and depression in their offspring (2019). Invited commentary of Haddad et al., 2019, Journal of Pediatrics. 2019; 210:239-242.

Sujan, A.C., Rickert, M.E., Class, Q.A., van Hulle, C. & D’Onofrio, B.M. (2019). Predictors and offspring outcomes associated with short and long interpregnancy intervals. Early Child Development and Care, 1-12, 10.1080/03004430.2019.1703111

Keenan, K., Hipwell, A.E., Class, Q.A., & Mbayiwa, K. (2018). Extending the developmental origins of disease model: Impact of preconception stress exposure on offspring neurodevelopment. Developmental Psychobiology, 60(7), 753-764. DOI:10.1002/dev.21773

Class, Q.A., Rickert, M.E., Larsson, H., Oberg, A.S., Sujan, A.C., Almqvist, C., Lichtenstein, P., & D’Onofrio, B.M., (2018). Outcome-dependent associations between short interpregnancy interval and offspring psychological and educational problems: A population-based quasi-experimental study. International Journal of Epidemiology, 47(4), 1159-1168. DOI: 10.1093/ije/dyy042.

For a list of Dr. Class’s publications, please click the following link: