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December 6th, 2014, 02:35 AM  #1 
Newbie Joined: Dec 2014 From: Ireland Posts: 1 Thanks: 0  Problem finding what the rate stands for
Hello people, I'm doing a data project on heart surgery. I have the data but I can't figure out what the rate means. For example there's one hospital which performed 6,865 heart surgeries. Of these, 234 resulted in the patient dying. The data says this is a mortality rate of 136.0. But it doesn't say what that rate is. Is it per 100 cases? Per 1000? I've done maths for these but they didn't turn out right. However, I wouldn't be surprised if I did something wrong. Anyone able to help? Thanks 
December 6th, 2014, 03:17 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,806 Thanks: 716 
The answer is 3.4%. The text should explain how it got their number.

December 6th, 2014, 05:07 PM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 
Simpler example: 6000 operations : 240 died 240/6000 = .04 = 4% 
December 7th, 2014, 04:20 AM  #4 
Math Team Joined: Apr 2010 Posts: 2,780 Thanks: 361 
136/3.4% = 4000, so 136.0 of about 4000 patients having heart surgery died. Maybe about 4000 heart surgeries/year/hospital on average?


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