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Table 1 Definitions

From: High yield of culture-based diagnosis in a TB-endemic setting

Definition   Formula
Relative incremental yield of method* 1 vs method 2 (RY) = % positive per method 2
   % positive per method 1
Absolute incremental yield of method 2 vs method 1 (AY) = % positive per method 2 - % positive per method 1
Number needed to diagnose one extra case of TB (NND) = 1
   AY (in %)
  1. Legend: *Method: can either be 1 smear, 2 smears, 1 culture, 2 cultures.