Usage History of 'apnea'

The following chart shows how frequently 'apnea' appeared in printed materials over time. For example, the word 'apnea' occurred 4 times in books in 1787 and 57,985 times in 2008. From 1787 to 2008, the word 'apnea' was used a total of 932,752 times in books scanned by Google. See Reference: Google Ngram project.

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