Figure 2:

Flowchart of the study. *A cesarean delivery is defined intrapartum if associated with at least one of the following: 1) trial of labor attempted if previous cesarean delivery; 2) induction of labor; 3) augmentation of labor; 4) antibiotics received by the mother during labor; and 5) clinical chorioamnionitis or maternal temperature >38°C diagnosed during labor. †Reasons for exclusion are not mutually exclusive. ‡Includes 1,381 counties in 45 states and Washington, DC^§¶ and 1,358,143 with labor neuraxial analgesia (78.02%).^§The states included are: AK, AL, AR, AZ, CA, CO, DC, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, WA, WI, WV, WY. ^¶1,296,146 women (74.5%) gave birth in their county of residence.