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Table 2 Comparison of avidity values from serum and CSF pairs obtained with different calculation methods from different dilutions (absorbance ratios) or different pairs of dilutions (new method and "Avidity 1.2"). For each method, mean values, standard deviations (SD) and coefficients of variation (CV) are presented.

From: A new method for determination of varicella-zoster virus immunoglobulin G avidity in serum and cerebrospinal fluid

  V2.1 V9.2 M22
  Serum CSF Serum CSF Serum CSF
absorbance ratios       
   Mean (%) 50.2 54.0 59.9 66.4 34.7 38.6
   SD (%) 5.6 5.4 7.8 8.5 4.1 6.1
   CV (%) 11.1 10.0 13.0 12.8 12.0 15.9
Avidity 1.2       
   Mean (%) 37.6 45.4 50.5 56.5 23.2 31.9
   SD (%) 3.7 3.0 3.0 4.6 2.3 3.6
   CV (%) 9.9 6.6 5.9 8.1 9.9 11.4
new method       
   Mean (%) 49.8 58.4 65.2 72.6 36.5 45.1
   SD (%) 2.4 4.1 1.4 7.5 2.0 0.9
   CV (%) 4.9 7.1 2.1 10.3 5.6 1.9