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Table 1 Two-by-two table for calculating sensitivity and specificity

From: Validity of parental recalls to estimate vaccination coverage: evidence from Tanzania

Agreement of sources   Vaccination status (Card-based source)  
  YES NO  
Vaccination status (Recall-based source) YES True positives (TP) False positives (FP) TP + FP
NO False negatives (FN) True negatives (TN) FN + TN
   TP + FN FP + TN Total (N)