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Thread: Significant Odds Ratio and Less Significant p-value

  1. #1 Significant Odds Ratio and Less Significant p-value 
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    Hi-

    Why would I get a more significant odds ratio (i.e. 1.4) and a p-value of 0.031 for one variable, and then for another variable, I have an odds ratio of 1.1, and a p-value of 0.013? I would have thought that the more significant the odds ratio, the more significant the p-value will be.

    Thanks!


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  3. #2  
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    Just to clarify, what I don't understand is why the variable with the highest OR has a less significant p-value, than the variable with the lowest OR.


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  4. #3  
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    Any help would be appreciated!
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  5. #4  
    exchemist
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    Quote Originally Posted by lem33 View Post
    Just to clarify, what I don't understand is why the variable with the highest OR has a less significant p-value, than the variable with the lowest OR.
    But it doesn't in your example. 1.4 > 1.1, and 0.031 > 0.013. Doesn't it?
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  6. #5  
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    Yes, but for p-values, the lower the number the more significant it is. For odds ratios, the higher the number the more significant it is. Thus, for the p-values, 0.013 is more significant than 0.031, and for the odds ratios, 1.4 is more significant than 1.1.
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  7. #6  
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    Quote Originally Posted by lem33 View Post
    Yes, but for p-values, the lower the number the more significant it is. For odds ratios, the higher the number the more significant it is. Thus, for the p-values, 0.013 is more significant than 0.031, and for the odds ratios, 1.4 is more significant than 1.1.
    Oh yes I see what you mean. I admit to not having used these terms for years. But don't we have to be careful what we are talking about? As I understand it (having now looked it up!) the "p-value" needs to refer to the probability of the result arising due to pure chance, i.e. if there is no correlation (the null hypothesis). So a low number suggests it probably is not due to chance, i.e. there probably is a correlation. With an odds ratio you don't refer to the null hypothesis…I think.

    Are you calculating the p-value and odds ratio yourself or are these numbers you have been given?
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