780
Participants
Start Date
May 31, 2008
Primary Completion Date
August 31, 2008
Study Completion Date
August 31, 2008
Epidural labor analgesia
Epidural analgesia initiated at the onset of regular uterine contraction
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 0.5cm
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 1.0cm
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 1.5cm
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 2.0cm
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 3.0cm
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 4.0cm
Epidural labor analgesia
Epidural analgesia initiated at the cervix diameter 5.0cm
Nanjing Maternal and Child Health Care Hospital, Nanjing
Lead Sponsor
HRSA/Maternal and Child Health Bureau
FED
Nanjing Medical University
OTHER