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. 2022 Oct 18;22:775. doi: 10.1186/s12884-022-05101-3

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Standardized risks of preterm delivery (delivery before 37 completed weeks of gestation) after COVID-19, according to week of infection and COVID-19 severity. The risk in a given “week of infection” for the COVID-negative group is the risk for someone whose pregnancy is ongoing that week (i.e., has not yet delivered) but who doesn’t have COVID-19. The overall risk of preterm delivery (left-hand panels) has been partitioned into the risk of indicated and spontaneous preterm delivery. Confidence intervals were estimated with the bootstrap