TABLE 2.

ED₅₀ values (95% CL) for fentanyl alone and in combination with NAQ in the assay of mechanical nociception and the dose ratios between them

Treatment	ED50 (95% CL)	Dose Ratio
Fentanyl alone	0.018 (0.012, 0.027)
0.32 NAQ/fent	0.032 (0.021, 0.049)	1.80
Fentanyl alone	0.021 (0.012, 0.035)
1 NAQ/fent	0.061 (0.039, 0.098)	2.90
Fentanyl alone	0.016 (0.009, 0.030)
3.2 NAQ/fent	0.137 (0.087, 0.216)	8.50
Fentanyl alone	0.028 (0.023, 0.036)
5.6 NAQ/fent	0.459 (0.327, 0.644)	16.12

fent, fentanyl.