It's not mine, and have nothing to do with it, and referring you to the disclaimer for use lol. I just added it to the conversation, which seems cool, and is not the first calculator I've seen for head and neck cancer. I think this is from Massacusets Genetal Hospital. I don't know what data it's based on, years, but it's the copyright that's from 2007-2011.
I guess one has to follow the legal terms or disclaimer for its use. Like gambling, it's for mature audiences only. Do I rely, believe on weather reports also, no. I would take it with a grain of salt, but there must be some criteria to their analysis, beyond my knowledge, interest.
http://lifemath.net/cancer/disclaimer.html