Table 1

Definitions
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 %)

Legend: *Method: can either be 1 smear, 2 smears, 1 culture, 2 cultures.

Demers et al.

Demers et al. BMC Infectious Diseases 2012 12:218   doi:10.1186/1471-2334-12-218

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