An Epidemiologist Is Tracking New Cases of ASD in a Rural

Multiple Choice

An epidemiologist is tracking new cases of ASD in a rural area.Which characteristics must be in place for these numbers to be valid?

A) A standardized definition of ASD must be used by all practitioners.
B) The methodology used to count ASD cases must be consistent,reliable,and valid.
C) All numbers collected before the year 2000 are incorrect and must be deleted.
D) Case counting must take place over an extended period.
E) Diagnoses must be verified by certified pediatricians.