1. The effect of addition of intrathecal clonidine to hyperbaric bupivacaine on postoperative pain and morphine requirements after Caesarean section: a randomized controlled trial 
I. van Tuijl, W. A. van Klei, D.B.M. van der Werff, C.J. Kalkman 
British Journal of Anaesthesia 
Volume 97, Issue 3, Pages (September 2006)
DOI: /bja/ael182
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
Kaplan–Meier plot of time to first analgesic request. In patients in whom clonidine (Group BC) or saline (Group B) was added to the spinal injection.
British Journal of Anaesthesia  , DOI: ( /bja/ael182)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions