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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