送交者: steven 于 2006-2-10, 18:53:21:
回答: 四维空间的虫子新到关于死亡率的讨论 由 conner 于 2006-2-10, 16:31:33:
the life expectancy for coal mine worker who started working at age 15 were 58.91 for surface workers and 49.23 for underground. Which is a lot less than what Ho proposed.
here is the link.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9090281&dopt=Abstract