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Re: MSTS RiskFrom: Allen Worrall (jworrall@alaska.net)Tue Feb 13 13:22:34 2001
Risk is, for example, 1 affected pregnancy in 270 pregnancies. In other words the lower or second number includes the affected pregnancy. An odds ratio is, for example, 1 affected pregnancy in x normal pregnancies. The second number does not include the affected pregnancy. Thus, to convert risk to odds, (when the risk is 1:270), reduce the second number by 1, so the odds ratio is now 1:269. So, if the risk is 1:1, I guess the odds would be 1:0, meaning there are no normal pregnancies. I am sure my explanation is simplistic.
-- Allen Worrall
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