Healthcare conferences the past year or two seem to have fewer companies presenting. The Rodman and UBS had a lot less then I remember while (now) it makes sense why Rodman was smaller not sure why UBS is this year. In addition there have been a few less healthcare conferences (because of bk/consolidation).
I don't know if there is a correlation to how much capital has been raised (which seems lower to me but I have no data on it) or if companies have just decided to present less given the prevalence of conference calls and scientific presentations attended/covered by investors/investment banks.