Table 2. Quantitative Sensory Testing Results.

There were no differences detected in the mean (standard deviation) quantitative sensory testing (QST) results between suspected opioid-induced hyperalgesia (OIH) patients and healthy controls.

	Healthy	Patients	P-value
	N = 20*	N = 20
Baseline QST
Threshold	3.0 (1.2)	2.7 (1.4)	0.432
Pain50	5.3 (1.4)	5.7 (1.5)	0.489
Tolerance	6.1 (1.2)	6.5 (1.6)	0.353
Post-placebo QST
Threshold	2.6 (1.1)	2.9 (1.5)	0.499
Pain50	4.9 (1.7)	5.7 (1.7)	0.130
Tolerance	5.8 (1.7)	6.6 (1.8)	0.173
Post-fentanyl QST
Threshold	3.0 (1.3)	3.6 (1.9)	0.328
Pain50	5.6 (2.0)	6.0 (2.0)	0.589
Tolerance	6.4 (1.9)	6.9 (2.0)	0.422

All quantitative sensory testing (QST) values listed are kg/cm².

^*Note that 2 healthy participants do not have data included for placebo & fentanyl QST.