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Table 2 IENFD by different observers for skin biopsy sites foot, back and thigh and total data

From: Significant difference between three observers in the assessment of intraepidermal nerve fiber density in skin biopsy

Skin biopsy site

Observer 1

Observer 2

Observer 3

Significance

Foot, n = 71

IENFD [fibers/mm]

IENFD [fibers/mm]

IENFD [fibers/mm]

p

Mean ± SD

4.88 ± 4.1

5.16 ± 4.00

3.57 ± 2.56

*

Range

0–22.8

0–23.8

0–13.21

-

Median

3.90

4.04

3.02

-

25–75% percentile

2.17–6.55

2.66–6.61

1.93–4.59

-

Inter section SD

0.76

0.84

0.5

**

Relative inter section SD

0.21

0.21

0.17

-

Back, n = 45

IENFD [fibers/mm]

IENFD [fibers/mm]

IENFD [fibers/mm]

-

Mean ± SD

15.97 ± 11.63

17.74 ± 11.73

12.20 ± 4.78

*

Range

0–56.08

0.54–55.61

1.7–22.88

-

Median

11.92

16.21

11.95

-

25–75% percentile

7.78–21.8

7.32–24.44

9.06–15.18

-

Inter section SD

1.67

2.09

1.16

-

Relative inter section SD

0.1

0.15

0.11

-

Thigh, n = 4

IENFD [fibers/mm]

IENFD [fibers/mm]

IENFD [fibers/mm]

-

Mean ± SD

4.15 ± 2.49

5.69 ± 4.21

2.12 ± 2.68

-

Range

1.38–8.13

2.07–12.86

0.19–6.68

-

Total, n = 120

IENFD [fibers/mm]

IENFD [fibers/mm]

IENFD [fibers/mm]

-

Mean ± SD

9.01 ± 9.48

9.89 ± 9.93

6.76 ± 5.52

*

Range

0–56.08

0–55.61

0–22.88

-

Median

5.51

6.29

4.86

-

25–75% percentile

3.1–11.2

3.69–12.37

2.31–11.14

-

Inter section SD

1.11

1.31

0.74

*

Relative inter section SD

0.17

0.19

0.16

-

  1. Significance: * p < 0.05 ** p < 0.01