A little puzzle from my new Epidemiology textbook

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The formatting is crappy but I enjoyed this little puzzle in my new textbook.  It is 'an historical event'.  I got it after a few minutes and found it a really good way to get me thinking about what could cause this mortality pattern.  I expect someone will get it quickly but if not, I'll post the answer tomorrow

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The other in social status was the crew. The social class of the passengers was defined by the class of berth they occupied.