Disease Prevalence 50% Prevalence Disease 10%

	Disease Prevalence 50%		Prevalence Disease 10%				Prevalence Disease 1%
	Yes	No		Yes	No	Yes		No
Test YES	TP 800 A	FP 100 B		TP 160 A	FP 180 B	TP 16 A		FP 198 B
Test NO	FN 200 C	TN 900 D		FN 40 C	TN 1,620 D	FN 4 C		TN 1,782 D
Totals	1,000	1,000		200	1,800	20		1,980

	Specificity= TN = TN+FP X 100- ________%		Specificity=				Specificity=

Expert Solution

The formula for specificity is = d/ b+d%

Thus 900/900+100 ×100 = 90%

Disease prevalence of 10% disease specificity is 1620/ 1620+180×100= 90%

Prevalence disease of 1% disease

1782/1782+198×100= 90%

Nightingale answered 2 years ago

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