Table 3 Electrophysiological measurements of the COVID-19 group with the peripheral neuropathy and control group (n = 40)

MNC amplitude (mV)

8.88 ± 2.60

9.04 ± 2.12

Median nerve

5.12–13.5

6.43–17.10

0.039*

MNC latency (ms)

5.1 ± 1.34

3.29 ± 0.64

Median nerve

2.59–7.45

2.16–4.78

 < 0.001*

MNC velocity (m/s)

58.06 ± 6.4

58.18 ± 7.30

Median nerve

42.40–69.30

45.92–70.9

0.220

SNC amplitude (mV)

21.18 ± 8.76

21.19 ± 5.94

Median nerve

11.5–45.4

12.45–38

0.091

SNC latency (ms)

4.33 ± 0.91

3.47 ± 0.72

Median nerve

3.08–6.20

2.76–5.23

0.305

SNC velocity (m/s)

51.7 ± 5.62

51.99 ± 6.84

Median nerve

42.9 – 59.24

41.29–69.2

0.753

F wave latency (ms)

33.03 ± 4.59

30.14 ± 6.16

Median nerve

26.6–39.3

24.56–44.56

0.389

MNC amplitude (mV)

12.30 ± 2.15

12.84 ± 2.70

Post Tibial nerve

7.39–17.53

8.24–19.1

0.366

MNC latency (ms)

3.99 ± 0.99

3.06 ± 0.61

Post Tibial nerve

2.25–5.6

2.29–4.22

0.007*

MNC velocity (m/s)

56.6 ± 5.44

57.05 ± 5.24

Post Tibial nerve

49.2–69.1

51.2–68.3

0.703

SNC amplitude (mV)

28.1 ± 4.44

28.25 ± 4.44

Sural nerve

21.2–35.3

21.3–36.2

0.956

SNC latency (m/s)

3.81 ± 0.6

3.01 ± 0.59

Sural nerve

2.68–4.70

2.11–3.98

0.760

SNC velocity (m/s)

56.7 ± 8.25

57.15 ± 6.05

Sural nerve

43.1–76.2

47.1–68.4

0.281

F wave latency (ms)

52.28 ± 4.95

47.25 ± 3.17

Post Tibial nerve

43.2–61.6

42.3–52.1

0.002*