"Using evidence in skeletons of people who died in the 1918 outbreak, researchers reported that people who suffered from chronic diseases or nutritional deficiencies were more than twice as likely to die as those who did not have such conditions, no matter their age."
https://www.nytimes.com/2023/10/09/health/1918-flu-skeletons.html
@interacter Here's the primary source with data:
@cyrilpedia ohh thank you :)