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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: J Pain. 2019 Mar 7;20(9):1040–1047. doi: 10.1016/j.jpain.2019.03.002

Table 1:

Cross-tolerance measures as a log shift relative to saline controls

Cross-tolerance Log shift
Fentanyl to Morphine 0.12
Morphine to Fentanyl −0.15
Mor/Fent to Morphine 0.30*
Mor/Fent to Fentanyl 0.02
Morphine to Mor/Fent 0.07
Fentanyl to Mor/Fent −0.10
Mor/Fent to Mor/Fent 0.33*
*

p < .05