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Table 1 Descriptive statistics for 33 sagittal MRI tonsillar position measurements (mm) as measured by seven expert operators

From: Cerebellar tonsil ectopia measurement in type I Chiari malformation patients show poor inter-operator reliability

MRI subject

Group

Descriptive statistics

Range (mm)

Mean (mm)

SD (mm)

Median

IQR

1

CM-Ia

5.80

8.49

1.72

8.30

2.30

2

Control

6.10

0.30

1.95

0.00

3.40

3

CM-Ia

6.00

− 0.34

1.89

0.00

3.10

4

CM-Ia

5.00

2.86

1.69

3.00

3.40

5

CM-Ia

4.80

10.49

1.70

11.10

2.90

6

CM-Is

9.00

10.01

2.92

11.00

1.70

7

CM-Ia

8.70

5.73

2.68

6.00

4.80

8

CM-Ia

7.80

11.16

2.37

11.30

3.40

9

CM-Ia

11.00

6.47

3.60

6.00

6.10

10

CM-Ia

5.00

2.99

1.95

3.00

4.60

11

CM-Ia

7.20

6.99

2.23

7.10

3.60

12

CM-Is

7.60

5.39

2.40

6.00

3.30

13

CM-Ia

5.00

10.77

1.82

11.20

4.10

14

CM-Ia

4.40

4.96

1.58

6.00

2.90

15

Control

7.30

− 2.96

3.42

0.00

7.00

16

CM-Ia

9.20

6.00

3.04

5.00

5.70

17

Control

7.30

0.70

2.39

0.00

4.80

18

Control

5.30

0.24

1.46

0.00

1.00

19

Control

10.00

1.09

3.31

0.00

6.00

20

Control

13.80

− 0.69

3.96

0.00

1.00

21

Control

12.40

0.47

3.75

0.00

6.00

22

Control

6.40

3.96

2.37

2.90

4.70

23

CM-Is

6.10

6.80

1.84

7.00

2.60

24

Control

10.80

0.74

3.05

0.00

3.00

25

CM-Is

7.90

6.64

2.64

7.90

4.00

26

CM-Is

5.20

6.17

1.89

6.00

3.80

27

CM-Is

10.00

18.20

3.22

17.00

5.00

28

CM-Is

9.30

16.90

4.07

14.00

9.00

29

CM-Is

4.40

8.93

1.87

10.00

3.80

30

CM-Is

8.70

8.16

2.73

7.00

4.00

31

CM-Is

6.90

5.84

1.95

5.60

1.40

32

CM-Is

11.00

12.24

3.44

13.00

5.30

33

Control

10.00

0.99

3.09

0.00

4.90

  1. CM-Ia type I Chiari malformation asymptomatic, CM-Is type 1 Chiari malformation symptomatic, IQR interquartile range, SD standard deviation