Table 2.
Features for the binary classifier of patient/non-patient
| Feature and feature perspectives | Possible value | Description |
| Semantic | ||
| Key word of patient | 0, 1 | Mr, mr., mrs, mrs., ms, ms., miss, yo-, y.o., y/o, year-old, … |
| Key word of doctor | 0, 1 | Dr, dr., md, m.d., m.d, … |
| Key word of doctor title | 0, 1 | Anesthesiologist, orthodontist, dentist, … |
| Key word of department | 0, 1 | Anesthesiology, electrophysiology, … |
| Key word of general department | 0, 1 | Team, service |
| Key word of general doctor | 0, 1 | Doctor, pcp, author, dict, attend, provider |
| Key word of relative | 0, 1 | Wife, brother, sister, sibling, nephew, … |
| Name | 0, 1 | A full uppercase mention, the first letter capital for each word in a mention |
| Last n line doctor | 0, 1 | Doctor's name in the last n lines |
| Twin or triplet information | 0, 1 | Baby 1, 2, 3, 4, … |
| Preceded by non-patient | 0, 1 | Dr XXX, he, … |
| Signed information | 0, 1 | Signed, dictator |
| Previous sentence | ||
| Next sentence | ||
| Grammatical | ||
| Pronouns we | 0, 1 | Our, we, us, ourselves |
| Pronouns I | 0, 1 | I, me, my, myself |
| Pronouns you | 0, 1 | You, your, yourself |
| Pronouns they | 0, 1 | They, their, them, themselves |
| Pronouns he/she most | 0, 1 | <He, him, his, himself>, <She, her, hers, herself> the most number of pronoun chosen |
| Who | 0, 1 | The previous mention |
| Appositive | 0, 1 | |
| Lexicon | ||
| First one/two/three words before mention | ||
| First one/two/three words after mention | ||
| First one/two/three words in between mention, problem | ||
| Last one/two/three words in between mention, problem | ||
| First one/two/three words in between mention, treatment | ||
| Last one/two/three words in between mention, treatment | ||
| First one/two/three words in between mention, test | ||
| Last one/two/three words in between mention, test | ||