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. 2021 Jul 8;11:14156. doi: 10.1038/s41598-021-93358-7

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© The Author(s) 2021

Open Access This 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/.

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(a) Distribution in percent of causes of death at various time intervals (0–24 h; 1–6 days; 7–28 days; > 28 days) during Period 1 and Period 2. *p < 0.05; significant change between Period 1 and Period 2 within each time interval. Congenital, congenital anomalies; Respiratory, respiratory causes; IVH, intraventricular hemorrhage; Infection, infection with septicemia; NEC, necrotizing enterocolitis. See Table 4 for further categorization of causes of death. (b) Distribution in percent of causes of death at various degrees of immaturity (gestational age < 28 weeks, 28–31 weeks and 32–36 weeks) during Period 1 and Period 2. *p < 0.05; significant change between Period 1 and Period 2 within each degree of immaturity. GA; gestational age; Congenital, congenital anomalies; Respiratory, respiratory causes; IVH, intraventricular hemorrhage; Infection, infection with septicemia; NEC, necrotizing enterocolitis. See Table 4 for further categorization of causes of death.