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Table 1 Classification of Data for Reliability and Validity Analyses (Two-by-Two Computation Table)

From: Validation of a multifactorial risk factor model used for predicting future caries risk with nevada adolescents

Assessment Results

With Disease

DMFT Score ≥ 1.0

Without Disease

DMFT Score = 0

Totals

High Caries Risk

[Moderate + High Risk Score]

True Positive [TP]

a

False Positive [FP]

b

Total test positives

a + b

Low Caries Risk

[Low Risk Score]

False Negative [FN]

c

True Negative [TN]

d

Total test negatives

c + d

Totals

Total with disease

a + c

Total without disease

b + d

Total population

a + b + c + d

Calculations

   

Specificity

a/a+c

Sensitivity

d/b+d

Predictive Value Positive

a/a+b

Predictive Value Negative

d/c+d

  1. Note. a] subjects who tested positive and classified 'with disease'; b] subjects who tested positive and classified 'without disease'; c] subjects who tested negative and classified' with disease'; and d] subjects who tested negative and classified 'without disease