An epidemiologist is tracking new cases of ASD in a rural area. Which characteristics must be in place for these numbers to be valid?
Note: Credit will be given only if all correct choices and no incorrect choices are selected.
Standard Text: Select all that apply.
1. A standardized definition of ASD must be used by all practitioners.
2. The methodology used to count ASD cases must be consistent, reliable, and valid.
3. All numbers collected before the year 2000 are incorrect and must be deleted.
4. Case counting must take place over an extended period.
5. Diagnoses must be verified by certified pediatricians.
1,2,4
Rationale 1: If a standardized definition of ASD is not used, some cases may be called ASD that are not and other cases of ASD may go uncounted.
Rationale 2: The counting method used in ASD surveillance must be consistent and reliable for the numbers to be valid.
Rationale 3: There is no indication that numbers collected before 2000 are not correct.
Rationale 4: Conducting counts over an extended period helps to eliminate variance due to unique clusters of counts.
Rationale 5: If a standardized case definition is used, there is no need to verify diagnoses.
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