Comparative in vitro study of the antimicrobial activities of different commercial antibiotic products of vancomycin

Table 5 Reproducibility of assays using Vancomycin (Cochran Test)

Concentration (mg/ml)	251.25	165.63	62.85	31.41	15.70	7.85
Standard deviation	0.096	0.076	0.237	0.084	0.100	0.270
Variance Coefficient (%)	0.4759	0.408422	1.4576	0.559623	0.7061	2.2425
Variance (S ² )	0.0092	0.00583	0.0113	0.00707	0.0099	0.01213
Sum (S ² )						0.05544