  We present a high density disc reflection spectral analysis of a sample of 17
Seyfert 1 galaxies to study the inner disc densities at different black hole
mass scales and accretion rates. All the available XMM-Newton observations in
the archive are used. OM observations in the optical/UV band are used to
estimate their accretion rates. We find that 65% of sources in our sample show
a disc density significantly higher than 1e15 cm^{-3}, which was assumed in
previous reflection-based spectral analyses. The best-fit disc densities show
an anti-correlation with black hole mass and mass accretion rate. High density
disc reflection model can successfully explain the soft excess emission and
significantly reduce inferred iron abundances. We also compare our black hole
spin and disc inclination angle measurements with previous analyses.
