A B737-800 DEPARTING CVG APPARENTLY MISREAD A PDC MESSAGE AND FLEW A FILED FLT PLAN RTE INSTEAD OF THE PDC MODIFIED RTE.

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DEPARTED CVG ARPT FOR ZZZ ON BLUEGRASS 7 OVER IIU. FLT PLAN RTE WAS IIU DIRECT MYSTIC (MYS) DIRECT POCKET CITY (PXV). AFTER IIU ZID ASKED OUR ROUTING AND I REPLIED ABOVE RTE. UPON FURTHER EXAM OF THE PRE-DEP CLRNC; THE 'CLRED' ROUTING SHOWED IIU DIRECT PXV. I BELIEVE THAT WE LOOKED AT THE 'FILED FLT PLAN' RTE; WHICH WAS DIRECTLY BELOW THE 'CLRED' RTE ON THE PDC WHEN LOADING THE FMS. THE CLOSE PROX OF THESE 2 RTES; AND THEIR SIMILARITY MUST HAVE CAUSED THE CONFUSION. I WOULD RECOMMEND ONLY PUTTING THE 'CLRED' RTE ON THE PDC TO AVOID FUTURE MISTAKES. FOR MY PART I WILL EXERCISE BETTER DILIGENCE IN MY CHKING OF ALL PDC ROUTINGS AND CLRNCS. SUPPLEMENTAL INFO FROM ACN 721885: I WAS UNAWARE THAT WE HAD BEEN GIVEN AN ADDITIONAL CLRNC AND FOLLOWED THE PDC ISSUED CLRNC I RECEIVED BEFORE TAXI OUT. WE DID HAVE A SLIGHT CHANGE FROM OUR FLT PLANNED RTE; ELIMINATING J112 AND SENDING US DIRECT FROM POINT TO POINT; BUT THAT WAS CORRECTED IN THE FMS RTE BEFORE TKOF. I WAS MADE AWARE OF THIS RPT SEVERAL HRS AFTER THE FLT BY THE CHIEF PLT'S OFFICE. ATC DID NOT NOTIFY US OF A COURSE DEV INFLT.