A paper in Acta Paediatrica, by researchers from Israel, looks at the conclusivesness of Cochrane Neonatal Reviews. They find that the majority are conclusive, the that they emphasise the need for further studies. The sample size and number of studies influences the ability of the review to be conclusive. Newer reviews are more likely to be conclusive than older ones.
Read the article at Acta Paediatrica 2006, 95, 1209-1212 -