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Table 3 NPV values in relation to prevalence, SE and SP values SE_SP = value of SE _ values of SP

From: Questioning the “SPIN and SNOUT” rule in clinical testing

NPV

PREVALENCE

0.2

0.4

0.6

0.8

SE_SP

0.8_0.8

0.94

0.86

0.73

0.50

0.4_0.8

0.84

0.67

0.47

0.25

0.8_0.4

0.89

0.75

0.57

0.33

0.4_0.4

0.73

0.50

0.31

0.14