(Left) Subbasal nerve densities measured by using the ConfoScan 4 were greater than those measured by using Tandem Scanning confocal microscope, although the data were well correlated (r=0.71, P<0.0001, n=82). The dotted line is the identity line and the solid line is the linear regression. (Right) The mean difference in subbasal nerve density between microscopes (ConfoScan 4 – Tandem Scanning) was 2,308 ± 3,885 µm/mm2 (dashed line, P<0.0001), and the difference increased with increasing density. The limits of agreement are indicated by the fine dotted lines.