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Table 1 Mean ± standard deviation of histogram parameters with resulted P values between different tumor grades obtained from ADC, post-contrast T1WI, and T2-FLAIR images

From: Grading of meningioma tumors based on analyzing tumor volumetric histograms obtained from conventional MRI and apparent diffusion coefficient images

Parameter

Grade I

Grade II

Grade III

P value

ADC (× 10−6 mm2/s)

Mean intensity

895.2 ± 9.3

678.6 ± 5.9

605.1 ± 8.5

< 0.01

Modal intensity

863.5 ± 10.6

659.4 ± 6.6

588.7 ± 5.8

< 0.01

Median intensity

910.3 ± 12.7

697.8 ± 7.4

613.0 ± 13.2

0.01

Maximum value

1233.2 ± 114.5

1205 ± 143.4

1162.7 ± 157.6

0.21

Minimum value

582 ± 88.5

535 ± 76.9

518 ± 98.6

0.15

10th percentile

645.6 ± 51.4

638.9 ± 44.6

622.2 ± 58.7

0.09

25th percentile

736.9 ± 55.4

725.5 ± 41.15

704.4 ± 54.3

0.11

75th percentile

1094.7 ± 33.6

1003.6 ± 37.5

927.6 ± 45.8

0.04

90th percentile

1148.8 ± 39.8

1044.5 ± 41.5

986.6 ± 46.0

0.02

Kurtosis

3.8 ± 0.6

3.5 ± 0.8

3.7 ± 1.2

0.08

Skewness

0.06 ± 0.11

0.07 ± 0.16

0.03 ± 0.18

0.24

SD

64.5 ± 13.3

56.6 ± 11.2

48.8 ± 13.7

0.02

T1WI-post-contrast

Mean intensity

1116.3 ± 84.5

1025.1 ± 79.6

818.6 ± 95.6

< 0.01

Modal intensity

1195.7 ± 88.9

1134.2 ± 85.1

925.7 ± 99.3

< 0.01

Median intensity

1044.8 ± 76.7

984.3 ± 78.1

776.3 ± 88.8

< 0.01

Maximum value

1343.8 ± 174.7

1296.3 ± 152.0

1158.7 ± 181.6

0.31

Minimum value

258.7 ± 94.6

225.6 ± 93.5

181.8 ± 76.6

0.24

10th percentile

512.9 ± 64.2

473.8 ± 58.7

426.3 ± 76.3

0.18

25th percentile

856.6 ± 58.2

731.3 ± 55.9

628.5 ± 61.8

0.04

75th percentile

1224.7 ± 90.4

1191.5 ± 87.2

989.6 ± 92.5

0.07

90th percentile

1296.8 ± 61.2

1238.5 ± 60.6

1078.9 ± 78.1

0.02

Kurtosis

3.9 ± 1.3

4.0 ± 1.2

5.3 ± 1.4

0.03

Skewness

− 0.36 ± 0.21

− 0.31 ± 0.24

− 0.19 ± 0.38

0.49

SD

128.7 ± 22.1

106.0 ± 23.6

95.4 ± 25.5

0.03

T2WI-FLAIR

Mean intensity

567.9 ± 67.4

523.6 ± 78.3

505.4 ± 79.9

0.09

Modal intensity

753.2 ± 54.6

678.4 ± 55.1

615.4 ± 58.0

0.01

Median intensity

659.2 ± 60.5

615.3 ± 66.9

578.3 ± 75.4

0.18

Maximum value

875.5 ± 82.3

794.8 ± 81.7

742.2 ± 75.2

0.16

Minimum value

189.5 ± 67.4

157.0 ± 65.2

201.2 ± 73.5

0.47

10th percentile

331.2 ± 58.2

302.6 ± 48.6

291.4 ± 52.3

0.28

25th percentile

385.5 ± 74.8

347.6 ± 66.7

321.2 ± 72.5

0.32

75th percentile

724.3 ± 86.9

688.3 ± 85.4

645.0 ± 91.6

0.21

90th percentile

814.6 ± 81.5

734.7 ± 77.9

692.2 ± 71.8

0.15

Kurtosis

4.1 ± 1.5

4.3 ± 0.9

5.8 ± 1.2

0.03

Skewness

− 0.43 ± 0.31

− 0.45 ± 0.28

− 0.31 ± 0.29

0.54

SD

58.2 ± 8.8

44.6 ± 6.4

36.3 ± 9.1

0.02