Table 3.

Components of measurement error for TpTe and QT

	TpTe		QT		(QT)a		(QT)bz
Source of variation	SD (ms)	% total	SD (ms)	% total	SD (ms)	% total	SD (ms)	% total
Between-participant	14	77	20	75	11	60	16	69
Between-visit	3	3	9	15	5	13	6	9
Within-visit	7	20	7	10	8	27	9	21
Total	16	100	23	100	15	100	19	100
ICC (95% CI)	0.77 (0.69, 0.85)		0.75 (0.65, 0.85)		0.60 (0.47, 0.73)		0.68 (0.57, 0.79)
SEM (ms)	8		11		9		6
MDC (ms)	21		32		26		29

SD: standard deviation; ICC: intra-class correlation coefficient; CI: confidence interval; SEM: standard error of measurement; MDC: minimum detectable change.

ICC=(between-participant variance)/(total variance)

SEM=√(between-visit variance + within-visit variance)

MDC=SEM*√2+1.96