<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by rhizomelic chondrodysplasia punctata ? [/INST] Rhizomelic chondrodysplasia punctata affects fewer than 1 in 100,000 people worldwide. RCDP1 is more common than RCDP2 or RCDP3. </s>