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Table 2 Accuracy and reliability of the semiautomatic segmentation

From: Semiautomatic segmentation of the kidney in magnetic resonance images using unimodal thresholding

  

N

Min

5th percentile

Mean

95th percentile

t

Max

SD

p (2-tailed)

MAD

Accuracy (difference to the reference volume)

Observer 1 (1)

48

−11.4

2.4

4.5

6.7

4.3

30.4

7.4

<0.01

6.6

Observer 1 (2)

48

−7.7

0.1

1.7

3.2

2.2

15.3

5.4

<0.05

5.4

Observer 2

48

−15.5

−3.6

−1.6

0.3

−1.7

11.2

6.7

0.095

4.4

Total

144

−15.5

0.4

1.5

2.7

2.6

30.4

7.0

<0.01

5.5

Inter-observer reliability

Observer 1 (1)/observer 2

48

−13.9

4.3

6.2

8.1

6.5

24.8

6.5

<0.01

7.3

Observer 1 (2)/observer 2

48

−7.6

1.9

3.3

4.7

4.9

13.9

4.7

<0.01

4.4

Total

96

−13.9

3.6

4.8

5.9

7.9

24.8

5.9

<0.01

6.0

Intra-observer reliability

Observer 1 (1)/observer 1 (2)

48

−6.3

1.5

2.9

4.2

4.4

15.1

4.5

<0.01

4.3