how do I run the this condition properly in Reactjs?

** ReactJs **

    let resultDisplay=""
    if(Bmi>=18 || Bmi<=25 )
     {resultDisplay= <p>Perfect</p> 
    }

Problem is right there but I can't figure it out since I new in React

    else if(Bmi<18)
      resultDisplay=<p>to Thin</p>

`` For me looks fine any guidence and help would be great ```

    else if(Bmi>25)
      resultDisplay=<p>Overweight</p>
      setresult(resultDisplay)
    
}

Right now its only working on one condition and doesn't rendering the other conditions results