The Full Form of NPN is Negative-Positive-Negative.
The negative predictive value is defined as: where a “true negative” is the event that the test makes a negative prediction, and the subject has a negative result under the gold standard, and a “false negative” is the event that the test makes a negative prediction, and the subject has a positive result under the gold standard.
NPN
means
Negative-Positive-Negative
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