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 RMT_0.2mV and TS_1mV, % test MEP for A-SICI and % RMT_0.2mV for T-SICI parameters; intraclass correlation coefficient (ICC) is a dimensionless measure. SD – standard deviation; SDC - smallest detectable change.

^aAveraged across four sessions.

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

^cMedian (interquartile range).

^dSingle measures.

^eAveraged measures.