# Question

Discussion in 'Step I' started by Toroloco, May 4, 2004.

1. ### Toroloco Member 5+ Year Member

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What is the formula for Reference Interval?
and Case Fatality Risk?
Thanks

2. ### Doreen Member 10+ Year Member

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Attending Physician
The risk from dying from a specific disease is described in the CFR

Case Fatality Rate = total death from disease "x" within a specified time after diagnosis / total# people acquiring disease "x"

The reference interval is used when a certain measurement on a patient is compared with the values for that measurement in a normal population. I don't believe there is a certain formula but I could be wrong.

3. OP

### Toroloco Member 5+ Year Member

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Well I have a formula but I'm not really sure if it is right or not.
In fact they give you a mean and 1 SD and they ask you to calculate Ref interval Well I guess is mean +/- 2 X SEM
and SEM = SD/square root of population.

Please someone tells me if I'm wrong.
Thanks

4. ### Doreen Member 10+ Year Member

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5. OP

### Toroloco Member 5+ Year Member

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Che, gracias Doreen por el dato

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