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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: J Virol Methods. 2010 Oct 21;171(1):111–116. doi: 10.1016/j.jviromet.2010.10.010

Figure 1. Comparison of log-scale assay results for samples diluted in PSFM.

Figure 1

Data points represent the mean measured result of samples 1a–7a with error bars representing ±1σ from the mean. Within the Virus Counter data set (triangles), the lowest three values are shown as unfilled triangles to indicate that these values were below the SQL determined for PSFM and were not included in the linear regression fit to the data. Coefficients of determination (R2) for linear regression fits to the data were 0.81 for Protein Sciences Corporation (diamonds with a dashed line), 0.97 for Baylor College of Medicine (squares with a dot-dash line) and 1.0 for InDevR (triangles with a solid line). Slopes of the regression fits were 1.1 ± 0.2 for Protein Sciences Corporation, 0.81 ± 0.07 for Baylor College of Medicine and 1.2 ± 0.1 for InDevR. Pearson correlation coefficients for the Virus Counter, Protein Sciences Corporation and Baylor College of Medicine were r = 0.94 (p < 0.01), r = 0.90 (p < 0.01) and r = 0.99 (p < 0.001), respectively.