A test was used to screen for autism in 2,500 children with diagnosed autism and
ID: 3376462 • Letter: A
Question
A test was used to screen for autism in 2,500 children with diagnosed autism and in 5,000 age- and race-matched control children. The results of the screening test were positive in 1,800 cases and in 800 control children, all of whom had not been diagnosed with autism.
Autism
No autism
Total
Positive screening test
1,800
800
2,600
Negative screening test
700
4,200
4,900
Total
2,500
5,000
7,500
What is the sensitivity of the autism screening test?
What is the specificity of the autism screening test?
What is the positive predictive value of the autism screening test?
What is the negative predictive value of the autism screening test?
Autism
No autism
Total
Positive screening test
1,800
800
2,600
Negative screening test
700
4,200
4,900
Total
2,500
5,000
7,500
Explanation / Answer
1) sensitivity of the autism screening test=true positive/total autistic =1800/2500=0.72
2)specificity of the autism screening test =true negative/no autistic =4200/5000=0.84
3) positive predictive value of the autism screening test =true positive/total psoitive=1800/2600=0.6923
4)negative predictive value of the autism screening test=true negative/total negative =4200/4900=0.8571
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