Accepted at 4:50 p.m. Nov, 30, 2025 by andrewmathias8
Author: salmanumer
Co-authors: andrewmathias8
Related Note: 1495670123090
Rationale for change

"Formulas
Prevalence = (incidence) × (average duration of disease)
If the population is in a steady state, the relationship between incidence rate (IR), prevalence (P), and the average duration of the disease (T) can be described mathematically as follows:
P/(1 - P) = IR × T
OR
IR = (P/(1 - P))/T
If the disease is extremely rare, P ≈ IR × T
Number of new cases per unit time = IR × (population at risk)"

https://next.amboss.com/us/article/Js0sDh?utm_source=anki&utm_medium=anki&utm_campaign=anki&utm_term=prevalence&guid=jT%253EM%253D%2560a-y%255E&aid=b50de450-0005-4bcc-852b-bae3e538acb2&uid=Dwsf1OCna#Z44a0fb80a8923b6e2fb8ff1f83d5803a

this formula is for rare diseases

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#AK_Step2_v12::#B&B::05_Epidemiology::01_General::07_Sensitivity_and_Specificity #AK_Step2_v12::#AMBOSS::iD0JVR #AK_Step2_v12::#Subjects::Epidemiology_&_Social_Sciences::Biostats::Sensitivity_Specificity_PPV_NPV #AK_Other::#AK_Original_Decks::Step_1::Zanki_Step_Decks::Zanki_Public_Health_Sciences::Epidemiology_&_Biostats #AK_Other::Only_Step_1&2_Overlap #AK_Step1_v12::#FirstAid::06_Public_Health::01_Epidemiology_and_Biostatistics::12_Incidence_vs_prevalence::*Incidence::Basics #AK_Step1_v12::#B&B::05_Biostats/Epi::02_Epidemiology::03_Sensitivity_and_Specificity #AK_Step1_v12::^Systems::Biostats #AK_Step1_v12::#OME_banner #AK_Step1_v12::#Low/HighYield::4-LowerYield #AK_Other::AnKing_Image::Mujeeb::Incidence_vs_prevalence #AK_Step1_v12::#Bootcamp::Biostatistics::03_Risk_Quantification::02_Interpreting_Prevalence_and_Incidence #AK_Step1_v12::#FirstAid::06_Public_Health::01_Epidemiology_and_Biostatistics::12_Incidence_vs_prevalence::*Prevalence::Basics #AK_Step1_v12::#NBME::30 #AK_Other::AnKing_Image::!Subjects::Epidemiology_&_Social_Sciences::Incidence_vs_prevalence #AK_Step1_v12::#AMBOSS::x1aEQj