What article reported variability in supporting hypotheses across disciplines?
Fanelli D (2010) “Positive” Results Increase Down the Hierarchy of the Sciences. PLoS ONE 5(4): e10068. doi:10.1371/journal.pone.0010068

http://www.plosone.org/article/info:doi%2F10.1371%2Fjournal.pone.0010068