These same persons were screened for diabetes on the basis of a single fasting blood glucose test. The particular screening method has a known sensitivity equal to 80% and a specificity equal to 96%. Based on findings of 14 positive tests, estimate and give 95% confidence intervals for the prevalence of diabetes among these employees.

143 These sample persons were also screened for hypertension by use of a standard sphygnomanometer examination, and based on this examination, 63 were positive. Of those screened as positive, 25 were given a more intensive evaluation for hypertension, and 21 were confirmed as being hypertensive. A sample of 50 persons was taken from those originally screened as negative, and 8 of these were found on the more intensive evaluation to be hypertensive. Based on these findings, what is the estimated prevalence of hypertension in this population? Give 95% confidence intervals for this estimated proportion.