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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)