Flora Z Statistic

#1
Hi,

I am a Post-Graduate Surgical Resident working on my Thesis. I need to analyze my data using the 'Flora Z Statistic'. Unfortunately even the statisticians I have met with have no idea what this is. Earlier studies that have used this method give their results but not how to actually use the formula.

I am in urgent need of assistance as my whole Thesis depends on this. I hope one of you can give me the correct formula and how to calculate it. As much information as possible please.

Hoping for your help.
Thanks.
 
#2
Hi,

The following is the formula for flora Z statistics.

Z = Actual survival - predicted survival
------------------------------------------
sqrt(predicted survival * predicted deaths)

I hope you might be using this for trauma cases.In that case you will have to use TRISS method to calculate the predicted survival and predicted deaths

regards,
Re.Vinaitheerthan
 
#3
Thanks.

Yes, my Thesis is on "efficacy of trauma scoring systems in predicting survival outcome" at my hospital. I have to calculate the Probability of survival using Revised Trauma Score (RTS) and Injury Severity Score(ISS).

RTS is the physiologic component of TRISS. In order to calculate it, I need to use the Abbreviated Injury Scale (AIS 90) coding system. I have been able to dig up most if the codes from several articles and sites on the internet. But so far failed to get a complete list of the codes in one place that I can give a reference to in my Thesis. Even those I have got are not the full codes.

If you are aware of any way I can get this, I would be most grateful.

Thanks again.
 
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