Table A4.

Prevalence of COVID-19 equal to 9.5% with sensibility equal 27% and specificity equal 84.9%.

	Covid-19
Oro-pharyngeal swabs		Present	Absent
	positive	5	27	32
	negative	14	154	168
		19	181	200

The numbers reported are based on the sensibility and specificity reported by Wang et al [29]. PPV = 5/32 = 15.6% -> means when the test is positive; the likelihood to have a COVID-19 patient is 15.6%. NPV = 154/168 = 91.7% -> means when the test is negative; the likelihood to have a NO COVID-19 patient is 91.7%.