TABLE 2.

Positive and negative predictive values for dogs’ performance of 90% sensitivity and 99% specificity and for the recommendations of the World Health Organization (WHO) and Paul Ehrlich Institute (PEI) among different COVID-19 prevalences in the target population.

COVID-19 prevalence	Dogs’ performance (SEN = 0.90, SPE = 0.99)		WHO and PEI recommendations (SEN = 0.80, SPE = 0.97)
	PPV	NPV	PPV	NPV
0.0010	0.0826	0.9999	0.0260	0.9998
0.0011	0.0902	0.9999	0.0285	0.9998
0.0012	0.0976	0.9999	0.0310	0.9998
0.0013	0.1049	0.9999	0.0335	0.9997
0.0014	0.1120	0.9999	0.0360	0.9997
0.0015	0.1191	0.9998	0.0385	0.9997
0.0016	0.1261	0.9998	0.0410	0.9997
0.0017	0.1329	0.9998	0.0434	0.9996
0.0018	0.1396	0.9998	0.0459	0.9996
0.0019	0.1463	0.9998	0.0483	0.9996
0.0020	0.1528	0.9998	0.0507	0.9996

SEN, sensitivity; SPE, specificity; PPV, positive predictive value; NPV, negative predictive value.