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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