# Table 3 Statistics for the regression analyses

Linear regression Exponential regression
Cytokine R R2 p A$pg × 1 ml µ$ B$pg ml$ R R2 p K$1 µl$ Y0× 10−3$pg ml$
IL-9 0.48 0.23 0.008 −163.46 7.7 × 10−3 0.39 0.15 0.035 −0.04 5.6
IL-10 0.40 0.16 0.027 −97.15 7.6 × 10−3 0.56 0.32 0.001 −0.02 7.7
IL-12p40 0.87 0.76 0.000 −317.36 12.0 × 10−3 0.87 0.76 0.000 −0.05 12.0
IL-12p70 0.71 0.50 0.000 −379.48 19.0 × 10−3 0.74 0.54 0.000 −0.03 20.0
IL-17A 0.38 0.15 0.037 −266.41 18.5 × 10−3 0.11 0.01 0.547 −0.01 12.7
Eotaxin 0.65 0.42 0.000 −438.07 18.0 × 10−3 0.74 0.55 0.000 −0.05 19.0
KC 0.83 0.70 0.000 −960.63 27.0 × 10−3 0.91 0.83 0.000 −0.16 26.0
MCP-1 0.91 0.83 0.000 −156.83 6.0 × 10−3 0.91 0.82 0.000 −0.05 6.4
MIP-1β 0.74 0.55 0.000 −278.96 11.0 × 10−3 0.47 0.22 0.009 −0.04 7.6
RANTES 0.72 0.52 0.000 −20.70 0.9 × 10−3 0.65 0.42 0.000 −0.04 0.8
1. For cytokines that were significantly different between serum and heparin, the data were analyzed for a correlation between the concentration of the analyte and the amount of heparin added; R, R2, p-values, slopes (A) and intercepts (B) for the linear regressions and intercepts (y0) and coefficients (K) for the exponential regressions are given. The calculations are based on the addition of 1 μl or 10 μl heparin (5,000 IU/ml). Where significant, the relationship between the specific cytokine concentration (pg/ml) and heparin (X) volume (μl) can be described as [Cyt] = B + A × X or $Cyt = y 0 × e − K × X$. 