They were defined as follows: LR+=P +/sick/P +/healthy = sensitivity/1-specificity and LR-=P -/sick /P - /healthy = 1-sensitivity/specificity.
Se definieron así: CP+ = P+/enfermo/P+/sano = sensibilidad/1-especificidad y CP- = P-/enfermo/P-/sano = 1-sensibilidad/Especificidad.