<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by adenosine monophosphate deaminase deficiency ? [/INST] AMP deaminase deficiency is one of the most common inherited muscle disorders in white populations, affecting 1 in 50 to 100 people. The prevalence is lower in African Americans, affecting an estimated 1 in 40,000 people, and the condition is even less common in the Japanese population. </s>