Usage History of 'preterm'

The following chart shows how frequently 'preterm' appeared in printed materials over time. For example, the word 'preterm' occurred 2 times in books in 1644 and 50,145 times in 2008. From 1644 to 2008, the word 'preterm' was used a total of 888,551 times in books scanned by Google. See Reference: Google Ngram project.

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