Incidence of Epidural Hematoma, Infection, and Neurologic Injury in Obstetric Patients

From Waking Up Costs, a study in the journal Anesthesiology attempts "to quantify some of the less common risks of having an epidural during labor: epidural hematoma, infection, and neurologic injury." He writes:

It contains an interesting tidbit others might find interesting, too. There are 4 million births in the United States each year and 2.4 million involve epidural analgesia. Wow. That's three fifth of all live birth get an epidural! (And some call nights, it seems every single one does...)