Alex - read carefully ...

That 34% are *part* *of* the 80% if I understand correctly.

80% had at least one breach, 43% had at least two.

And 34% didn't have a clue how many breaches they had - they may well have been aware of at least one. It wouldn't surprise me if that 34% were pretty computer-literate - they have the ability to *spot* a breach, but no authority to *do* *anything* *about* *it*.

Cheers,
Wol

Almost 80 per cent of the 1,112 IT workers surveyed claimed to have had at least one data breach in the first half of 2008. A clueless 34 per cent shrugged their shoulders and said they had no idea how many breaches they had suffered in that time period.

80+34 = 100 
looks like ATI math

It is unfortunate but true that whenever a breach happens the odds are that an employee is invloved in some capacity.