Fig 4. Adjusted odds ratios for severe maternal morbidity by maternal characteristics and clinical factors, stratified by method of delivery: NYS 2008–2013 delivery hospitalizations.

aOR for severe maternal morbidity and 95% confidence limits: Vaginal delivery designated with a red circle; Cesarean delivery designated with a black square. aOR derived from logistic regression model adjusting for year of delivery, maternal and hospital characteristics, medical history and clinical factors, and comorbid conditions. When comorbidities were dropped from the model, the findings for remaining factors did not differ substantively.