Yes, bg's change on 1,3,5 etc because we wanted it be more easy to track numbers since it's tons of data.
Outgoing hits are 99,99% unique, in rare case raw is sent out.
no img=traffic without images(fake browsers, bots etc)
no trades=traffic from domains who are not in your traders and SE lists
not counted=clicks after X clicks setted to count in settings/out
u.in and u.out=% of uniques on in and out.