Table 4. Sensitivity and specificity of two methods CHROMagar^TM StrepB (CHROM-B) and blood agar (BA)

Media	Day	True - positive	False-positive	True-negative	False-negative	Sensitivity (%)	Specificity (%)	p-value
CHROM-B	D1 (18h)	36	0	206	16	69.23	100.00	0.024
	D2 (42h)	47	0	206	5	90.38	100.00	< 0.001
BA	D2 (48h)	31	0	206	21	59.62	100.00