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Table 3 Significant (p < .05) variables from analysis of the statistical properties of the pore multi-ROIs

From: High-resolution micro-CT with 3D image analysis for porosity characterization of historic bricks

Measured variables Brick A Brick B Brick C Brick D Brick E Brick F
Vol. max µm3 1.20E+10 1.28E+10 0.93E+10 1.04E+10 1.46E+10 2.33E+10
Surface area (interp.) max µm2 7.28E+08 7.33E+08 6.11E+08 8.17E+08 11.3E+08 16.8E+08
Surface area (interp.) SD µm2 2.69E+04 3.88E+04 2.80E+04 3.00E+04 3.61E+04 6.12E+04
Vol./sur area (interp.) mean µm 3.31 3.32 3.24 3.18 3.06 2.62
Vol./sur area (interp.) SD µm 1.79 1.77 1.76 1.44 1.30 0.90
Aspect ratio mean 0.168 0.164 0.160 0.160 0.154 0.096
Aspect ratio SD 0.200 0.202 0.202 0.198 0.192 0.168
Min Feret diameter SD µm 27.3 31.0 29.0 25.2 22.3 18.4
Mean Feret diameter mean µm 36.7 35.6 34.6 34.8 32.9 24.6
Mean Feret diameter SD µm 45.7 51.3 45.4 40.6 35.3 28.5
Max Feret diameter mean µm 45.2 43.3 42.2 42.3 39.8 29.5
Max Feret diameter SD µm 59.2 61.7 56.0 49.9 43.1 33.7
Min ortho Feret diameter mean µm 25.1 24.9 24.3 24.4 22.6 18.5
Min ortho Feret diameter SD µm 28.5 32.0 29.6 25.9 23.1 19.1
Min ortho/max Feret diameter mean µm 0.650 0.664 0.664 0.666 0.656 0.702
Min ortho/max Feret diameter SD µm 0.152 0.148 0.150 0.144 0.148 0.138
  1. The lowest value of the means for each variable is in italics; the highest value is in bold. Brick data = mean of 5)