The analysis of data from 632 firms from both OECD and non-OECD countries indicates that in general, SMEs [small/medium enterprises] have used advanced technologies less than larger firms in the past and received a lower payoff. They also expect to use such these technologies less in the future.
It is more difficult to come up with evidence than I expected but at least I found this
http://www.jnbit.org/upload/Hyland_Kennedy_Mellor-2-2-2004.pdf