Equals, I haven't heard of too many people who were on pred for a significant amount of time who didn't have side effects. I can list some for you but it won't tell you a % based on which people experienced which symptoms.
This may be helpful:
http://www.webmd.com/drugs/mono-9383-PREDNISONE+-+ORAL.aspx?drugid=6007&drugname=prednisone+oral&pagenumber=6