Suppose 84 of hypertensives and 23 of normotensives are clas

Suppose 84% of hypertensives and 23% of normotensives are classified as hypertensive by an automated blood-pressure machine. What is the PV^+ of the machine, assuming 20% of the adult population is hypertensive?

Solution

Suppose there are 1000 cases, from the given information we can form the table.

Disease

H+

H-

Total

Test

H+

168

184

352

H-

32

616

648

Total

200

800

1000

PV= 168/352 =0.4773 Or 47.73%

Answer: b. 47.73%

		Disease
		H+	H-	Total
Test	H+	168	184	352
	H-	32	616	648
	Total	200	800	1000