Table 3 Spearman’s correlation coefficients between preoperative nerve conduction measures and difference in grip strength and DASH

Instrument scale

0–6 Difference of GP

6–12 Difference of GP

0–12 Difference of GP

DML (ms)

− 0.26

0.07

− 0.15

SCV (m/s)

0.23

0.21

0.27

CMAP amplitude (mV)

0.04

−0.07

−0.36

SNAP amplitude (μV)

0.04

0.14

0.13

Instrument scale

0–6 Difference of DASH score

6–12 Difference of DASH score

0–12 Difference of DASH score

DML (ms)

−0.01

− 0.1

− 0.03

SCV (m/s)

0.16

−0.03

0.26

CMAP amplitude (mV)

−0.16

−0.28

− 0.49

SNAP amplitude (μV)

−0.20

0.28

0.11