Table 1. Means and standard deviation of means for pain modulation in VAS ratings of perceived intensity and the behaviorally assessed pain perception (negative values indicate pain inhibition; positive values indicate pain facilitation).

	Pain modulation in VAS ratings of pain intensity						Pain modulation in behavioral measure (°C)
	placebo		levodopa		naltrexone		placebo		levodopa		naltrexone
	n=28		n=27		n=28		n=28		n=27		n=28
Outcome	M	SD	M	SD	M	SD	M	SD	M	SD	M	SD
win	–7.31	21.51	–12.98	23.54	–10.09	23.79	–0.09	0.64	–0.14	0.66	–0.05	0.74
lose	12.21	21.12	13.29	20.48	12.26	22.27	0.03	0.59	0.03	0.54	0.06	0.68