Table 2. Cross-tabulation and classification of errors found in proficiency testing by rechecking slides from a peripheral laboratory by reference laboratory.

Correct: no false reading & no quantification error; QE: quantification error;

SFN/SFP: scanty false negatives and scanty false positives

FN: false negatives; FP: false positives

　

Over all agreement = (T - all false readings)/T

(T = total number of slides assessed)

False negative rate = (SFN + FN1 + FN2 + FN3) / total negative slides read by PL

False positive rate = (SFP + FP1 + FP2 + FP3) / total positive slides read by PL

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