Usage History of 'hypopnea'

The following chart shows how frequently 'hypopnea' appeared in printed materials over time. For example, the word 'hypopnea' occurred 4 times in books in 1907 and 3,049 times in 2008. From 1907 to 2008, the word 'hypopnea' was used a total of 25,852 times in books scanned by Google. See Reference: Google Ngram project.

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