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Figure 2 Correlation (solid line = linear regression) between right atrial (RA) neuronal noradrenaline transporter (NAT) density and age of 18 patients (see Fig. 1A). Ordinate: RA NAT density in fmol of (³H)-nisoxetine specifically bound/mg protein; abscissa: age of patients in years. Solid line: y = –1.104x + 177.4; r = –0.906; R² = 0.644; p < 0.0001. Dotted lines represent 95% confidence limits for the regression line.