# prevalence ratio question

I understand that prevalence ratio is

                            Number of people in sample with characteristic
Prevalence ratio =  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Total # of people in sample


https://www.nimh.nih.gov/health/statistics/what-is-prevalence

My question is does the denominator in this formula include the numerator ? Are the number of people with disease included in the Total # of people in the sample ?

• Jan 14 at 19:18

$$\text{Prevalence of }X\text{ in pop.} = \frac{\text{No. people with }X\text{ in pop.} }{\text{No. people with }X \text{ in pop.} + \text{No. people without }X \text{ in pop.}}$$