Table 2.

Regression equation, correlation coefficient, linearity range, and LLOQ of each analyte.

Analytes	Regression equation	Correlation coefficient (r)	Linearity range (μg/mL)	LLOQ (μg/mL)
PZA	Y PZA = (0.2423 ± 0.0006) x + (0.0230 ± 0.0046)	0.9992 ± 0.0004	1.02∼60.0	1.02
INH	Y INH = (0.6607 ± 0.0323) x + (0.0090 ± 0.0071)	0.9991 ± 0.0004	0.152∼10.0	0.152
EMB	Y EMB = (0.3503 ± 0.0012) x + (0.0027 ± 0.0015)	0.9995 ± 0.0003	0.0998∼5.99	0.0998
RFP	Y RFP = (0.1839 ± 0.1354) x + (0.0185 ± 0.0046)	0.9982 ± 0.0020	0.500∼30.0	0.500

PZA: pyrazinamide, INH: isoniazid, RFP: rifampicin, EMB: ethambutol, and LLOQ: lower limit of qualification.