Table 3 Remaining PHI analysis by tool, I2B2 corpus.

From: Protected Health Information filter (Philter): accurately and securely de-identifying free-text clinical notes

PHI category Instances of PHI remaining (PHIlter) Instances of PHI remaining (Physionet) Instances of PHI remaining (Scrubber)
Age 0 1 0
Device 0 6 0
Medical record 0 524 18
Patient 2 154 92
Date 0 4590 1587
Fax 0 2 0
Phone 0 31 67
Zip 0 3 1
Username 1 92 92
Street 2 27 21
Location-other 2 9 12
Idnum 2 297 206
City 2 14 52
Doctor 5 197 186
  1. PHI counts for PHIlter, Physionet and Scrubber performance on the I2B2 corpus.