A public health department plans a screening program in a population of 100,000 school-aged children. If true prevalence of FASD is 3%, the screening test has sensitivity 85% and specificity 90%, how many children are expected to screen positive, and how many of those are true positives?

• A. 12,250 screen-positive children in total, of whom 2,550 are true positives.
• B. 9,700 screen-positive children in total, of whom 9,700 are true positives.
• C. 3,000 screen-positive children in total, of whom 3,000 are true positives.
• D. 100,000 screen-positive children in total, of whom 85,000 are true positives.

Answer: (A)