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Sn = a/( a+c ) Sp = d/( b+d ) = 141/202 = 162/250

Sn = a/( a+c ) Sp = d/( b+d ) = 141/202 = 162/250 = 0.70 x 100 = 0.65 x 100 = 70 % = 65%. PPV = a/( a+b ) NPV = d/( c+d ) = 162/223 = 141/229 = 0.73 x 100 = 0.62 x 100 = 73% = 62%. LR (+) = Sn /(1-Sp)

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Sn = a/( a+c ) Sp = d/( b+d ) = 141/202 = 162/250

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  1. Sn = a/(a+c) Sp = d/(b+d) = 141/202 = 162/250 = 0.70 x 100 = 0.65 x 100 = 70% = 65%

  2. PPV = a/(a+b) NPV = d/(c+d) = 162/223 = 141/229 = 0.73 x 100 = 0.62 x 100 = 73% = 62% LR (+) = Sn/(1-Sp) = 0.70 /0.35 = 2 LR (-) = (1-Sn)/Sp = 0.30/0.65 = 0.46

  3. Pre-test Probability = (a+c)/(a+b+c+d) = 202/452 = 0.45 x 100 = 45% Pre-test odds = pre-test probability / (1-pre-test probability) = 0.45/0.55 = 0.82 Post-test odds = pre-test odds x LR = 0.82 x 2 = 1.64 Post-test Probability = post-test odds / (post-test odds + 1) = 1.64/ 2.64 = 4.28

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