Table 4.

True disease status and Test 2 results.

		True Disease Status
		+	-
Test 2	+	r [1 - Φ (x - μC2)]	(1 - r) [1 - Φ (x - μN2)]
	-	r Φ (x - μC2)]	(1 - r)Φ (x - μN2)

Test 2 is + if the score on Test 1 is greater than x.