给定问题Q，根据表格序列H回答。
问题Q：What is the F1 score of the POS ngrams for predicting sentiment change？
表格序列H：
<C> Editorial change  F1 score, General lexical features, Unigrams,.51<bold>, Topics,.51<bold>, LIWC + Politeness,.48, Dependency Parses,.46, Adjectival modifiers,.42, Personal pronouns,<max>.51<bold>, POS ngrams,.51<bold>, Content Interplay + Status,.35,<C> Sentiment change  F1 score, General lexical features, Unigrams,.54, Topics,.56, LIWC + Politeness,.55, Dependency Parses,.51, Adjectival modifiers,.46, Personal pronouns,.39, POS ngrams,<max>.57<bold>, Content Interplay + Status,.39,Table 3: Performance of Logistic Regression classifier on different features.
