Hi Ksenia,
So the key here is the exhibit, which points out the prevelance and pentration rate for the US. The #s multiplied across the 3 diseases gets you the total # of people currently in wheelchairs. Then, the x 3% portion is essentially saying 3% of that population will die per year.
The "base" US deal rate is around 1% of the total pop per year. However, given that this is a more compromised population, one can assume a much higher death rate (here, the author decided 3x).
This is up the to the candidate's judgement and is part of market sizing!

Hi Ksenia,
So the key here is the exhibit, which points out the prevelance and pentration rate for the US. The #s multiplied across the 3 diseases gets you the total # of people currently in wheelchairs. Then, the x 3% portion is essentially saying 3% of that population will die per year.
The "base" US deal rate is around 1% of the total pop per year. However, given that this is a more compromised population, one can assume a much higher death rate (here, the author decided 3x).
This is up the to the candidate's judgement and is part of market sizing!
