Our results are comparable with the lexical simplification system for English presented in (Biran et al., 2011), whose frequency baseline for English target words (medium frequency) is very similar to ours (42.86%).
53.84% of the manually substituted target words were not simplified by LexSiS, and 78.57% of these manual substitutions were found to be simpler synonyms by the annotators (see Table 4).