Table 1.

Reliability measures for the subjective behavioural ratings of pain and alertness. ICC, intraclass correlation coefficients; CV, coefficient of variation.

VAS reliability
Visual analogue scales	Inter-subject		Inter-session		Intra-session
			Left vs right		Left		Right
	ICC	CV	ICC	CV	ICC	CV	ICC	CV
Pain intensity	0.456	0.285	0.602	0.200	0.830	0.300	0.861	0.267
Alertness	0.664	0.359	0.640	0.203	0.800	0.390	0.940	0.320