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Table 4 Precision data for the determination of the studied drugs by the proposed methods

From: Simultaneous determination of cetirizine, phenyl propanolamine and nimesulide using third derivative spectrophotometry and high performance liquid chromatography in pharmaceutical preparations

Parameters Intra-day Inter-day
\(\overline{\text{x}} \pm {\text{S}} . {\text{D}}\) % RSD % Error \(\overline{\text{x}} \pm {\text{S}} . {\text{D}}\) % RSD % Error
3rd Derivative method
 CTZ (μg/mL)
  8 99.04 ± 1.04 1.05 0.61 100.05 ± 0.24 0.24 0.14
  20 98.04 ± 0.45 0.46 0.27 98.8 ± 0.27 0.27 0.16
  40 97.65 ± 0.53 0.54 0.31 98.93 ± 0.25 0.25 0.15
 PPA (μg/mL)
  20 98.89 ± 1.27 1.29 0.74 99.08 ± 0.85 0.86 0.49
  50 100.7 ± 1.85 1.84 1.06 99.99 ± 1.42 1.42 0.82
  100 99.2 ± 1.83 1.85 1.07 100.59 ± 1.18 1.17 0.68
 NMS (μg/mL)
  40 98.23 ± 0.77 0.79 0.45 99.27 ± 1.09 1.1 0.63
  100 99.27 ± 1.22 1.32 0.71 100.6 ± 0.6 0.60 0.34
  120 98.32 ± 0.62 0.63 0.36 99.91 ± 1.02 1.02 0.59
HPLC method
 CTZ (μg/mL)
  8 98.63 ± 0.95 0.96 0.56 100.53 ± 0.68 0.67 0.39
  20 98.87 ± 0.49 0.50 0.29 100.75 ± 0.4 0.39 0.23
  40 98.18 ± 0.47 0.48 0.27 98.15 ± 1.1 1.12 0.65
 PPA (μg/mL)
  20 98.23 ± 0.55 0.56 0.32 99.53 ± 0.49 0.5 0.29
  50 98.07 ± 0.15 0.16 0.09 99.88 ± 0.17 0.17 0.10
  100 98.23 ± 0.83 0.83 0.49 98.94 ± 0.21 0.22 0.12
 NMS (μg/mL)
  40 98.52 ± 0.62 0.63 0.36 98.77 ± 0.42 0.42 0.24
  100 98.67 ± 0.36 0.36 0.21 99.45 ± 0.52 0.52 0.30
  120 98.52 ± 0.95 0.96 0.55 100.24 ± 0.87 0.87 0.5
  1. Each result is the average of three separate determinations