When I first started talking with my doctor at Penn in late 2010/early 2011 & we had the initial facts & figures talk, it was estimated that the national averages for double lung transplants were around 50-60 percent from what I remember. In addition to that percentage seeming to correlate with data I could find online during that time from reputable sources. I am going to be honest, some of the initial information was hard pill to swallow & the statistics hard to hear.