TABLE 1

Intraday (boldface) and interday (italicized) assay variability from five rifampicin concentration-response experiments conducted in triplicate

Experiment No.	1 μM RIF			10 μM RIF			30 μM RIF			50 μM RIF			Curve-Fit Parameters^a
Experiment No.		Average	CV^b	Average	CV	Average	CV	Average	CV	EC₅₀	E_max	r²	γ
		%		%		%		%
1	4.1	6	7.4	3	8.2	2	9.0	11	2.1	10	0.98	0.56
2	5.5	27	12	23	13	23	14	22	1.7	14	0.99	0.93
3	5.4	17	10	14	10	14	12	13	1.3	12	0.98	0.76
4	6.3	23	12	15	16	15	16	16	3.1	19	0.99	0.62
5	3.8	15	8.1	25	11	16	8.1	29	1.5	9.7	0.95	1.1
Average	5.0		9.9		12		12		1.9	13
CV	21%		22%		25%		28%		37%	28%

↵ a Data were fit using a Hill function (three-parameter) according to the following equation: y = (E_max · x^γ)/(EC₅₀^γ + x^γ).
↵ b CV = coefficient of variation (standard deviation/average).