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Table 2 Results of accuracy, precision, and recovery for method validation using quality control (QC) samples

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

Groups QC ng/mg Recovery (%) Intra-day n=8 Inter-day n=16
Precisiona (CV%) Accuracyb (bias%) Precision (CV%) Accuracy (bias%)
Addicts’ group 1.5 86.84 8.1 4.7 4.9 2.9
3 91.18 1.5 −1.2 4.6 −1.4
6 91.78 0.8 −5.1 3.9 −4.2
Rehab group 1.5 87.81 2.6 −8.7 6.9 1.1
3 93.62 1.1 −1.2 3.6 −1.9
6 90.84 0.6 −4.6 2.3 −4.8
  1. aExpressed as the relative standard deviation of the peak area ratios of the target compound/IS. bCalculated as [(calculated mean concentration − nominal concentration)/nominal concentration] × 100