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[This corrects the article DOI 10.1093/geroni/igz022.]. © The Author(s) 2019. Published by Oxford University Press on behalf of The Gerontological Society of America.STUDY QUESTION Do maternal serum levels of progesterone metabolites early in pregnancy correspond to an increased risk for very preterm delivery prior to 32 weeks? SUMMARY ANSWER Maternal serum levels of 11-deoxycorticosterone (DOC) measured during the late first trimester or early second trimester correlate with an increased risk for preterm delivery prior to 32 weeks, and