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. 2018 Jul-Aug;11(4):806–817. doi: 10.1016/j.brs.2018.03.002

Table 1.

Reliability of corticospinal excitability parameters.

TMS parameter Mean ± SDa Intraclass correlation coefficient
Coefficient of repeatability (SDC)
Intraday
Interday
Interday averagedb
Intraday Interday Interday averagedb
ICC(2,1)d ICC (2,k)e ICC (2,1)d ICC (2,k)e ICC (2,1)d ICC (2,k)e
RMT0.2mV 48.6 ± 6.7 0.935 0.966 0.678 0.808 0.811 0.895 5.5 11 8.5
TS1mV 57.6 ± 9.4 0.915 0.955 0.725 0.841 0.750 0.857 10 14 15
A-SICI50 89 ± 14.2 0.123 0.218 0.144 0.252 0.286 0.444 58 62 42
A-SICI60 57.8 ± 19.6 0.287 0.446 0.511 0.676 0.394 0.565 69 59 49
A-SICI70 30.6 ± 18.2 0.371 0.541 0.373 0.543 0.513 0.678 52 55 40
A-SICI80 22.1 ± 11.1 0.329 0.496 0.424 0.595 0.541 0.702 32 29 24
A-SICI slope 199.4 ± 49.4 0.173 0.295 0.511 0.676 0.449 0.620 179 152 120
peak A-SICI 17.4 ± 9.8 0.423 0.595 0.510 0.675 0.576 0.731 28 28 20
T-SICI50 2.3 ± 4.7 0.414 0.586 0.529 0.700 0.582 0.736 15 9 9
T-SICI60 10.4 ± 13.0
5.7 (8.4)c
0.924 0.961 0.883 0.938 0.925 0.961 10 12 10
T-SICI70 20.4 ± 15.9 0.923 0.96 0.615 0.761 0.651 0.789 14 27 28
T-SICI80 23.0 ± 14.6 0.809 0.895 0.608 0.756 0.858 0.923 22 25 16
T-SICI slope 56.1 ± 39.1 0.88 0.936 0.827 0.905 0.870 0.930 43 42 40
peak T-SICI 28.8 ± 17.7 0.871 0.931 0.816 0.899 0.893 0.944 20 20 16

Mean ± SD and coefficient of repeatability are expressed as % MSO for RMT0.2mV and TS1mV, % test MEP for A-SICI and % RMT0.2mV for T-SICI parameters; intraclass correlation coefficient (ICC) is a dimensionless measure. SD – standard deviation; SDC - smallest detectable change.

a

Averaged across four sessions.

b

Two subsequent measurements made on the same day averaged and used to calculate interday reliability.

c

Median (interquartile range).

d

Single measures.

e

Averaged measures.