1. Volume 373, Issue 9680, Pages 2034-2040 (June 2009)
Progesterone for the prevention of preterm birth in twin pregnancy (STOPPIT): a randomised, double-blind, placebo-controlled study and meta-analysis 
Prof Jane E Norman, MD, Fiona Mackenzie, MB, Philip Owen, MD, Helen Mactier, MD, Kevin Hanretty, MD, Sarah Cooper, MD, Prof Andrew Calder, MD, Prof Gary Mires, MD, Peter Danielian, MD, Stephen Sturgiss, MD, Graeme MacLennan, MSc, Graham Tydeman, MB, Prof Steven Thornton, DM, Bill Martin, DM, Prof James G Thornton, MD, Prof James P Neilson, MD, Prof John Norrie, MSc 
The Lancet 
Volume 373, Issue 9680, Pages (June 2009)
DOI: /S (09)
Copyright © 2009 Elsevier Ltd Terms and Conditions

2. Figure 1
Trial profile.
The Lancet  , DOI: ( /S (09) )
Copyright © 2009 Elsevier Ltd Terms and Conditions

3. Figure 2
Meta-analysis of the effect of progesterone in prevention of preterm delivery before 34 weeks' duration
The figure shows the odds ratio for each study as a square (with size proportional to the amount of information) and the horizontal line depicts the 95% CIs. The open diamond indicates the odds ratio (OR) with 95% CI overall. The vertical line, at the odds ratio of unity, corresponds to the line of no effect.
The Lancet  , DOI: ( /S (09) )
Copyright © 2009 Elsevier Ltd Terms and Conditions