The improvement is about three or four percent immediately after the course, and then it goes down. And at the end of the day, the improvement is about 0.1 percent, not zero, but as humanly close to zero as possible.
La mejora es de un 3 o 4 %, inmediatamente después del curso, y luego baja Y al final, la mejora es de un 0,1 %, no cero, sino tan humanamente cercano a cero como sea posible.