RESEARCH THE METHOD OF EPIDURAL ANALGESIA DURING LABOR FROM 1/2010 TO 10/2015 IN HANOI OBSTETRIC AND GYNECOLOGY HOSPITAL Retrospective study, described in the 15 733 women having an epidural anesthesia during labor pain relief from 1/2010 to 10/2015 in Hanoi Obstetric and Gynecology Hospital.