Manually aborted CHKDSK /r at this point, was data changed? [duplicate]

CHKDSK does not make any changes to the disk until the scanning is complete, and any changes made to the disk are specifically stated by CHKDSK after the scan is complete.

To stay on the safe side, you should rerun CHKDSK (to completion this time) as soon as possible to make sure there is nothing corrupted on the disk, and to not aggravate any corruption present in the disk.

From TechNet:

Interrupting chkdsk is not recommended. However, canceling or interrupting chkdsk should not leave the volume any more corrupt than it was before chkdsk was run. Rerunning chkdsk checks and repairs any remaining corruption on the volume.