{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,2]],"date-time":"2025-08-02T16:19:28Z","timestamp":1754151568235,"version":"3.41.2"},"reference-count":54,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2025,3,27]],"date-time":"2025-03-27T00:00:00Z","timestamp":1743033600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Paediatric Perinatal Epid"],"published-print":{"date-parts":[[2025,5]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Fluctuations in daily delivery volume impact obstetricians' workload and maternal\u2013fetal complications. While sudden drops in atmospheric pressure (e.g. due to typhoons or hurricanes) may be associated with an increase in daily delivery volume in the following days, few studies have explored these associations by gestational week while considering lagged effects.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To investigate whether drops in atmospheric pressure are associated with fluctuations in the daily volume of deliveries with spontaneous onset of labour.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We employed a time\u2010stratified case\u2010crossover design. Data on the daily volume of spontaneous\u2010onset deliveries from 47 prefectures between 2011 and 2020 were obtained from the Japan Perinatal Registry Network database. Quasi\u2010Poisson regression models with distributed lag nonlinear models were used to examine the association between pressure drops (e.g. \u221213.8\u2009hectopascal (hPa), representing the 1st percentile) and daily delivery volume in each prefecture, with lag periods of up to 14\u2009days. Prefectural estimates were combined using random\u2010effects meta\u2010analysis. Stratified analyses were conducted by the gestational week, categorised as &lt;\u200937, 37, 38, 39, 40 and 41+ weeks.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 1,074,380 spontaneous\u2010onset deliveries were recorded. The lag\u2010cumulative relative risk of spontaneous\u2010onset deliveries peaked with a lag period of 0\u20134\u2009days and became negligible beyond 1\u2009week, likely due to harvesting effects. The associations were most pronounced among women with a gestational age between 38 and 40\u2009weeks. Specifically, for a PCN of \u221213.8\u2009hPa, the 0\u20134\u2009day lag\u2010cumulative relative risk was as follows: at 38\u2009weeks, 1.07 (95% confidence interval [CI] 1.00, 1.14); at 39\u2009weeks, 1.08 (95% CI 1.02, 1.14); and at 40\u2009weeks, 1.10 (95% CI 1.03, 1.19), compared to no pressure change.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Pressure drops were associated with a modestly larger volume of spontaneous\u2010onset deliveries over the following few days, especially at full\u2010term gestation.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ppe.70012","type":"journal-article","created":{"date-parts":[[2025,3,29]],"date-time":"2025-03-29T19:24:00Z","timestamp":1743276240000},"page":"327-335","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Drops in Atmospheric Pressure and Subsequent Fluctuations in Daily Delivery Volume: A Case\u2010Crossover Study"],"prefix":"10.1111","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8591-4607","authenticated-orcid":false,"given":"Shuhei","family":"Terada","sequence":"first","affiliation":[{"name":"Department of Public Health Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hisaaki","family":"Nishimura","sequence":"additional","affiliation":[{"name":"Department of Public Health Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naoyuki","family":"Miyasaka","sequence":"additional","affiliation":[{"name":"Department of Obstetrics and Gynecology Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takeo","family":"Fujiwara","sequence":"additional","affiliation":[{"name":"Department of Public Health Institute of Science Tokyo  Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,3,27]]},"reference":[{"key":"e_1_2_10_2_1","first-page":"e125","article-title":"Trends in Hospital\u2010Based Childbirth Care: The Role of Health Insurance","volume":"19","author":"Kozhimannil K. 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