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© March 30, 2008 Sorana Daniela BOLBOACĂ && Lorentz JÄNTSCHI

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Contingency Table Medical Key Parameters

2X2 Contingency Table		Result		Sum
		Positive	Negative
Procedure	Positive	a	b	a+b
	Negative	c	d	c+d
Sum		a+c	b+d	a+b+c+d

Medical Key Parameter: Experimental Event RateAbsolute Risk in the Exposed GroupPredictive Pozitive ValuePost Test ProbabilityIndividual Risk on Exposure GroupIncidence RateSensitivityPositive Test WrongFalse Positive OddsFalse Negative OddsControl Event RateAbsolute Risk in the Unexposed GroupNegative Test WrongIndividual Risk in the Unexposure GroupSpecificityNegative Predictive ValueProbability of a Positive TestAccuracy (global accuracy of a diagnostic test)Probability of a Negative TestPrevalence RatePost Test OddsPre Test OddsOdds RatioExcess RiskAbsolute Risk IncreaseAbsolute Risk ReductionNumber Needed to TreatNumber Needed to HarmRelative RiskPositive Likelihood RatioNegative Likelihood RatioRelative Risk ReductionRelative Risk IncreaseEtiological Fraction among the Exposed Group