1. Researchers propose the clinical use of a new screening test to detect type 2 diabetes mellitus. The researchers initially propose screening the entire population. Subsequently, they propose only screening participants with a BMI greater than 30kg/mA2. Changing the screening population is most likely to have which of the following effects on this test?

1. Decrease in pretest probability
2. Decrease in prevalence
3. Increase in positive predictive value
4. Increase in sensitivity
5. - Increase in specificity-