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. Author manuscript; available in PMC: 2018 May 3.
Published in final edited form as: J Biomed Inform. 2017 Mar 22;69:55–62. doi: 10.1016/j.jbi.2017.03.014

Table 4.

Distribution of negation.

Corpus Sentences in corpus Sentences with negation (%)
Blogs 4473 18.91%
Simple English Wikipedia 6491 19.15%
Cochrane 91,184 19.39%
PubMed 19,698 12.48%
Clinical trials 48,304 15.14%
English Wikipedia 60,108 20.00%