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Table 1 Calibration method for sample

From: Detection of 6-monoacetylemorphine in hair sample of heroin addicts using gas chromatography–mass spectrometry and significance of rehabilitation program

Groups Conc ng/mg tR min Slope (mean± S.D) y-intercept Linearitya (R2) LODb (ng/mg) LLOQc (ng/mg)
Addicts’ group 0.1–25 7.23 0.334±0.010 0.0572 0.9984 0.0745 0.22
Rehab group 0.1–25 7.22 0.265±0.032 0.0412 0.9937 0.0311 0.09
  1. aLinearity is described by the determination coefficient for the calibration curve (y=ax+b). bThe limit of detection (LOD) was based on the concentration corresponding to a signal plus 3 standard deviations from the mean of 10 replicates of the blank hair. cThe lower limit of quantification (LLOQ) was defined as the lowest concentration on the calibration curve with precision (CV%) less than 20% and accuracy (bias%) within ±20%