The same test used to screen a population with low case rates (pregnant clinic patients, 7%)6 does not perform as well.
When the same test was used to screen a population of low-income families in Orlando, it was found to not be as effective. 
mnli hypothesis: When the same test was used to screen a population of low-income families in Orlando, it was found to not be as effective.  premise: The same test used to screen a population with low case rates (pregnant clinic patients, 7%)6 does not perform as well.