Concept clarification: which pre-test probability to use for the Fagan’s nomogram

Dear all,
I am currently testing the diagnostic accuracy of my predictive model. I hope to visualize my model using Fagan’s nomogram. I want to ask for the pre-test probability (i.e. prevalence) in the nomogram, should I plug in the prevalence of the disease from the literature or the pre-test prevalence/proportion of the disease in my own dataset ?

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