1. Moon, R. Y. & Task Force on Sudden Infant Death Syndrome. SIDS and other sleep-related infant deaths: Evidence base for 2016 updated recommendations for a safe infant sleeping environment. Pediatrics. https://doi.org/10.1542/peds.2016-2940. (2016)
2. GBD. Mortality and causes of death collaborators. Global, regional, and national life expectancy, all-cause mortality, and causespecifc mortality for 249 causes of death, 1980–2015: A systematic analysis for the Global Burden of Disease Study 2015. Lancet 388, 1459–1544. https://doi.org/10.1016/S0140-6736(16)31012-1 (2016).
3. Krous, H. F. et al. Sudden infant death syndrome and unclassifed sudden infant deaths: A defnitional and diagnostic approach. Pediatrics 114, 234–238. https://doi.org/10.1542/peds.114.1.234 (2004).
4. Goldstein, R. D. et al. Inconsistent classifcation of unexplained sudden deaths in infants and children hinders surveillance, prevention and research: Recommendations from the 3rd International Congress on Sudden Infant and Child Death. Forensic Sci. Med. Pathol. 15, 622–628. https://doi.org/10.1007/s12024-019-00156-9 (2019).
5. Shipstone, R. A., Young, J., Tompson, J. M. D. & Byard, R. W. An evaluation of pathologists’ application of the diagnostic criteria from the San Diego defnition of SIDS and unclassifed sudden infant death. Int. J. Legal Med. 134, 1015–1021. https://doi.org/10. 1007/s00414-019-02126-w (2020).
6. Garstang, J., Cohen, M., Mitchell, E. A. & Sidebotham, P. Classifcation of sleep-related sudden unexpected death in infancy: A national survey. Acta Paediatr. 110, 869–874. https://doi.org/10.1111/apa.15472 (2021).
7. Shapiro-Mendoza, C. K. et al. Variations in cause-of-death determination for sudden unexpected infant deaths. Pediatrics https:// doi.org/10.1542/peds.2017-0087 (2017).
8. Shapiro-Mendoza, C. K., Tomashek, K. M., Anderson, R. N. & Wingo, J. Recent national trends in sudden, unexpected infant deaths: More evidence supporting a change in classifcation or reporting. Am. J. Epidemiol. 163, 762–769. https://doi.org/10.1093/ aje/kwj117 (2006).
9. Taylor, B. J. et al. International comparison of sudden unexpected death in infancy rates using a newly proposed set of cause-ofdeath codes. Arch. Dis. Child. 100, 1018–1023. https://doi.org/10.1136/archdischild-2015-308239 (2015).
10. Erck Lambert, A. B., Parks, S. E. & Shapiro-Mendoza, C. K. National and state trends in sudden unexpected infant death: 1990– 2015. Pediatrics https://doi.org/10.1542/peds.2017-3519 (2018).
11. de Visme, S. et al. National variations in recent trends of sudden unexpected infant death rate in western Europe. J. Pediatr. 226, S0022-3476. https://doi.org/10.1016/j.jpeds.2020.06.052 (2020).
12. Lavista Ferres, J. M., Anderson, T. M., Johnston, R., Ramirez, J. M. & Mitchell, E. A. Distinct populations of sudden unexpected infant death based on age. Pediatrics https://doi.org/10.1542/peds.2019-1637 (2020).
13. Blair, P. S., Byard, R. W. & Fleming, P. J. Sudden unexpected death in infancy (SUDI): Suggested classifcation and applications to facilitate research activity. Forensic Sci. Med. Pathol. 8, 312–315. https://doi.org/10.1007/s12024-011-9294-x (2012).
14. Hauck, F. R. et al. Research priorities in sudden unexpected infant death: An international consensus. Pediatrics https://doi.org/ 10.1542/peds.2016-3514 (2017).
15. Smith, G. C. & White, I. R. Predicting the risk for sudden infant death syndrome from obstetric characteristics: A retrospective cohort study of 505,011 live births. Pediatrics 117, 60–66. https://doi.org/10.1542/peds.2004-2828 (2006).
16. Booth, J. et al. Machine learning approaches to determine feature importance for predicting infant autopsy outcome. Pediatr. Dev. Pathol. 24, 351–360. https://doi.org/10.1177/10935266211001644 (2021).
17. Moerbeek, M. Bayesian evaluation of informative hypotheses in cluster-randomized trials. Behav. Res. Methods 51, 126–137. https:// doi.org/10.3758/s13428-018-1149-x (2019).
18. Ministry of Health, Labour and Welfare of Japan. Te Japanese National Vital Statistics Database, Natality https://www.e-stat.go. jp/en/stat-search?page=1&toukei=00450011 (2006–2018).
19. Goldberg, N., Rodriguez-Prado, Y., Tillery, R. & Chua, C. Sudden infant death syndrome: A review. Pediatr. Ann. 47, e118–e123. https://doi.org/10.3928/19382359-20180221-03 (2018).
20. Carlin, R. F. & Moon, R. Y. Risk factors, protective factors, and current recommendations to reduce sudden infant death syndrome: A review. JAMA Pediatr. 171, 175–180. https://doi.org/10.1001/jamapediatrics.2016.3345 (2017).
21. Adams, S. M., Ward, C. E. & Garcia, K. L. Sudden infant death syndrome. Am. Fam. Phys. 91, 778–783 (2015).
22. Anderson, T. M. et al. Maternal smoking before and during pregnancy and the risk of sudden unexpected infant death. Pediatrics https://doi.org/10.1542/peds.2018-3325 (2019).
23. Mitchell, E. A. et al. Risk factors for sudden infant death syndrome following the prevention campaign in New Zealand: A prospective study. Pediatrics 100, 835–840. https://doi.org/10.1542/peds.100.5.835 (1997).
24. Sullivan, F. M. & Barlow, S. M. Review of risk factors for sudden infant death syndrome. Paediatr. Perinat. Epidemiol. 15, 144–200. https://doi.org/10.1046/j.1365-3016.2001.00330.x (2001).
25. Erck Lambert, A. B. et al. Death scene investigation and autopsy practices in sudden unexpected infant deaths. J. Pediatr. 174, 84-90.e1. https://doi.org/10.1016/j.jpeds.2016.03.057 (2016).
26. Putnam-Hornstein, E., Schneiderman, J. U., Cleves, M. A., Magruder, J. & Krous, H. F. A prospective study of sudden unexpected infant death afer reported maltreatment. J. Pediatr. 164, 142–148. https://doi.org/10.1016/j.jpeds.2013.08.073 (2014).
27. Osawa, M., Nagao, R., Kakimoto, Y., Kakiuchi, Y. & Satoh, F. Sudden infant death afer vaccination: Survey of forensic autopsy fles. Am. J. Forensic Med. Pathol. 40, 232–237. https://doi.org/10.1097/PAF.0000000000000494 (2019).
28. Bajanowski, T. et al. Sudden infant death syndrome (SIDS)—standardised investigations and classifcation: Recommendations. Forensic Sci. Int. 165, 129–143. https://doi.org/10.1016/j.forsciint.2006.05.028 (2007).
29. Ichikawa, K., Kato, I. & Togari, H. An investigation of healthy infant sleep environments at their home. J. Jap. SIDS Res. Soc. 18, 3–11 (2018).
30. Togari, H., Kato, I., Saito, N. & Yamaguchi, N. Te healthy human infant tends to sleep in the prone rather than the supine position. Early Hum. Dev. 59, 151–158. https://doi.org/10.1016/s0378-3782(00)00096-7 (2000).
31. Ministry of Health, Labour and Welfare of Japan. Te Japanese national nutrition survey on preschool children. https://www.e-stat. go.jp/stat-search?page=1&toukei=00450271 (2015).
32. Japan Tobacco Inc. Annual Japan smoking rate survey. https://www.jt.com/media/news/2018/pdf/20180730_02.pdf (2018).
33. Lefèvre, T., Lepresle, A. & Chariot, P. Detangling complex relationships in forensic data: Principles and use of causal networks and their application to clinical forensic science. Int. J. Legal Med. 129, 1163–1172. https://doi.org/10.1007/s00414-015-1164-8 (2015).
34. Howey, R., Shin, S. Y., Relton, C., Davey Smith, G. & Cordell, H. J. Bayesian network analysis incorporating genetic anchors complements conventional Mendelian randomization approaches for exploratory analysis of causal relationships in complex data. PLOS Genet. 16, e1008198. https://doi.org/10.1371/journal.pgen.1008198 (2020).
35. Nikovski, D. Constructing Bayesian networks for medical diagnosis from incomplete and partially correct statistics. IEEE Trans. Knowl. Data Eng. 12, 509–516. https://doi.org/10.1109/69.868904 (2000).
36. Osawa, M. et al. Circumstances and factors of sleep-related sudden infancy deaths in Japan. PLoS ONE 15, e0233253. https://doi. org/10.1371/journal.pone.0233253 (2020).
37. Ihaka, R. & Gentleman, R. R. R: A language for data analysis and graphics. J. Comput. Graph. Stat. 5, 299–314. https://doi.org/10. 1080/10618600.1996.10474713 (1996).
38. Kanda, Y. Investigation of the freely available easy-to-use sofware “EZR” for medical statistics. Bone Marrow Transpl. 48, 452–458. https://doi.org/10.1038/bmt.2012.244 (2013).