| | Feature | Description | Amount | Label |
| | Lexical features | Based on content feature | (1) Amount of Chinese characters | | 1 | F1 | | (2) Total number of characters | | 1 | | (3) Total number of numeric characters | | 1 | | (4) Amount of non-Chinese characters | | 1 | | Based on lexical features | (5) Amount of words | | 1 | | | (6) Different words | | 1 | | (7) Hapax legomena | Words that appear only ONCE | 1 | | (8) Hapax dislegomena | Words that appear only TWICE | 1 | | (9) Average sentence length | | 1 |
| | Syntactic feature | (10–17) punctuation frequency | “, ”, “. ”, “? ”, “! ”, “: ”,”; ”, “ / ”, “ ” ” | 8 | F2 | | (18–59) frequency of function words | put, be, about, accord, from, as, compare, include, like, make, need, possible, ‘s, get, pass, ah, yeah, oh, maybe, all, just, later, then, if, though, actually, but later, then, after, in short, until, often, feel, how, but yes, indeed | 42 | | (60–79) frequency of parts of speech | n.; V.; adj.; adv.; vl; nt; pron.; nS; m; f; q; prep.; conj.; aux.v; int.; nh; W; x; vu; i | 20 |
| | Based on content feature | (80) Total number of sentences | | 1 | F3 | | (81–95) frequency of specific keywords | Treatment, symptoms, side effects, patient, function, alleviation, period, safety, health, improvement, effect, treatment, significant, recurrence, effective | 15 |
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