+ Reply to Thread
Results 1 to 3 of 3

Thread: Which statistical test to compare mortality risk scores?

  1. #1
    Points: 35, Level: 1
    Level completed: 70%, Points required for next Level: 15

    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Which statistical test to compare mortality risk scores?




    Hi,

    I am an ICU doctor and I am doing a study comparing the validity of three different mortality risk scores (lets call them test1, test2 and test3). They calculate a predicted mortality risk percentage based on various clinical parameters.
    I have applied all three on the same population, which I know whether they have survived or not (outcome).

    My question is this: is there a statistical test to check the significance between test1 vs outcome, test2 vs outcome, test3 vs outcome and the agreement between test1 and test3, test2 and test3 (independent of outcome)?

    thanks
    Attached Images  
    Last edited by yiatros; 11-29-2016 at 06:58 PM.

  2. #2
    Points: 2,462, Level: 30
    Level completed: 8%, Points required for next Level: 138

    Posts
    200
    Thanks
    20
    Thanked 48 Times in 43 Posts

    Re: Which statistical test to compare mortality risk scores?

    Hi,

    to test how precise your three test methods predict the outcome, you can run a logistic regression model for each test, with the test-score as the predictor, and the OUTCOME as the categorical outcome variable. Size and significance related to the predictors give the information you want. To compare the three methods among themselves, you can compare the three models via AIC-value: The lowest Value gives you the prefered model. However, in order to develop a good survival prediction method, I would actually investigate also models which more that one of your test methods, i.e. the models

    outcome ~ test1
    outcome ~ test2
    outcome ~ test3
    outcome ~ test1 + test2
    outcome ~ test1 + test3
    outcome ~ test2 + test3
    outcome ~ test1 + test2 + test3

    probably the combination of different tests gives you the best prediction.

    You can compare the test scores of the different methods independent of the outcome via correlation. Pearsons correlatin if data are normally distributed, Speamann's or Kendalls correlation else

  3. #3
    Points: 35, Level: 1
    Level completed: 70%, Points required for next Level: 15

    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Smile Re: Which statistical test to compare mortality risk scores?


    thank you for the advice!!!!

+ Reply to Thread

           




Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats