Table 2.

Accuracy of radiological (a) and clinical diagnosis (b) vs. serology

(a)
COVID-19 Higher Certainty	Serology +		Serology −			Total
Radiological 1/1	19		5			24	PPV 0.79 (0.58–0.93)
0/0, 2/2	4		24			28	NPV 0.86 (0.67–0.96)
Total	23		29			52
	Sens 0.83 (0.61–0.95)		Spec 0.83 (0.64–0.94)
COVID-19 lower certainty
Radiological 1/1, 1/0, 0/1, 1/2, 2/1	22		13			35	PPV 0.63 (0.45–0.79)
0/0, 2/2	4		24			28	NPV 0.86 (0.67–0.96)
Total	26		37			63
	Sens 0.85 (0.65–0.96)		Spec 0.65 (0.47–0.80)
(b)
COVID-19 Higher Certainty		Serology +		Serology −	Total
Clinical 1/1		20		5	25		PPV 0.80 (0.59–0.93)
0/0		2		19	21		NPV 0.90 (0.70–0.99)
Total		22		24	46
		Sens 0.91 (0.71–0.99)		Spec 0.79 (0.58–0.93)
COVID-19 lower certainty
Clinical 1/1, 1/0, 0/1		24		18	42		PPV 0.57 (0.41–0.72)
0/0		2		19	21		NPV 0.90 (0.70–0.99)
Total		26		37	63
		Sens 0.92 (0.75–0.99)		Spec 0.51 (0.34–0.68)

Sens = sensitivity; Spec = Specificity; PPV = positive predictive value, NPV = negative predictive value.