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However, little is known about the association of <jats:styled-content style=\"fixed-case\">SDB<\/jats:styled-content> with timing of delivery. We examined the association of snoring frequency, a key <jats:styled-content style=\"fixed-case\">SDB<\/jats:styled-content> marker, and snoring intensity, a correlate of <jats:styled-content style=\"fixed-case\">SDB<\/jats:styled-content> severity, with time\u2010to\u2010delivery among a cohort of pregnant women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In this prospective cohort study, 1483 third trimester pregnant women were recruited from the University of Michigan prenatal clinics. Women completed a questionnaire about their sleep, and demographic and pregnancy information was abstracted from medical charts. After exclusion of those with hypertension or diabetes, 954 women were classified into two groups by their snoring onset timing, chronic or pregnancy\u2010onset. Within each of these groups, women were divided into four groups based on their snoring frequency and intensity: non\u2010snorers; infrequent\u2010quiet; frequent\u2010quiet; or frequent\u2010loud snorers. Cox proportional hazard regression models were used to investigate the association between snoring frequency and intensity and time\u2010to\u2010delivery, adjusting for maternal characteristics.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Chronic snoring was reported by half of the pregnant women, and of those, 7% were frequent\u2010loud snorers. Deliveries before 38\u00a0weeks\u2019 gestation are completed occurred among 25% of women with chronic, frequent\u2010loud snoring. Compared with pre\u2010pregnancy non\u2010snorers, women with chronic frequent\u2010loud snoring had an increased hazard ratio for delivery (adjusted hazard ratio 1.60, 95% confidence interval 1.04, 2.45).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Snoring frequency and intensity is associated with time\u2010to\u2010delivery in women absent of hypertension or diabetes. Frequent\u2010loud snoring may have a clinical utility to identify otherwise low\u2010risk women who are likely to deliver earlier.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ppe.12511","type":"journal-article","created":{"date-parts":[[2018,9,29]],"date-time":"2018-09-29T00:24:02Z","timestamp":1538180642000},"page":"504-511","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Associations of snoring frequency and intensity in pregnancy with time\u2010to\u2010delivery"],"prefix":"10.1111","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7240-4923","authenticated-orcid":false,"given":"Galit Levi","family":"Dunietz","sequence":"first","affiliation":[{"name":"Department of Neurology Sleep Disorders Center University of Michigan  Ann Arbor Michigan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kerby","family":"Shedden","sequence":"additional","affiliation":[{"name":"Department of Statistics 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