Table 3 Comparison of different nerve conduction study parameters between the three patients’ groups and the control group

  Median SNAP CV (m/s)

43.37 ± 7.21 ^{c, d}

54.44 ± 4.28

44.84 ± 9.74 ^{c, g}

54.80 ± 4.77 ^{d, g}

(K) 62.904

≤ 0.0001*

  Median SNAP amp (μV)

19.87 ± 11.18 ^{c, e}

28.66 ± 17.55

20.44 ± 8.60 ^{c, h}

29.43 ± 10.81 ^{e h}

(K) 22.003

≤ 0.0001*

  Ulnar SNAP CV (m/s)

54.60 ± 5.08

56.98 ± 4.44

54.97 ± 4.07

55.34 ± 4.62

(K) 4.997

0.172

  Ulnar SNAP amp (μV)

24.23 ± 11.27

30.04 ± 13.22

22.81 ± 9.29

25.55 ± 7.43

(K) 4.240

0.237

  Median DL (ms)

4.52 ± 1.09 ^{c, f}

3.50 ± 0.35

4.24 ± 0.87 ^{c, i}

3.45 ± 0.38 ^{f, i}

(K) 62.318

≤ 0.0001*

  Median CMAP amp (mV)

9.22 ± 3.03

10.12 ± 3.67

10.29 ± 4.13

9.80 ± 3.21

(K) 2.042

0.564

  Ulnar DL (ms)

3.01 ± 0.35

2.96 ± 0.37

3.00 ± 0.36

3.02 ± 0.31

(K) 0.887

0.828

  Ulnar CMAP amp (mV)

8.45 ± 2.61

9.45 ± 3.33

9.10 ± 2.76

8.23 ± 2.19

(K) 3.613

0.306

Padua neurophysiological classification scale

  Class 1 (negative CTS) ^a

9 (15.8)

NA

8 (28.6)

NA

(X²) 3.956

0.556

  Class 2 (minimal CTS) ^a

5 (8.8)

NA

3 (10.7)

NA

  Class 3 (mild CTS) ^a

20 (35.1)

NA

7 (25.0)

NA

  Class 4 (moderate CTS) ^a

19 (33.3)

NA

9 (32.1)

NA

  Class 5 (severe CTS) ^a

3 (5.3)

NA

0 (0)

NA

  Class 6 (extreme CTS) ^a

1 (1.8)

NA

1 (3.6)

NA