Comment author: Vladimir_Nesov 11 September 2011 02:59:38PM 2 points [-]

the odds that he had had the disease even given the positive test were a million to one

Should be "one to a million".

Comment author: WhetherMan 15 September 2011 01:11:47PM 1 point [-]

I think "one IN a million" is the more common usage in American English.