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. Author manuscript; available in PMC: 2020 Apr 22.
Published in final edited form as: Pain. 2017 Mar;158(3):391–399. doi: 10.1097/j.pain.0000000000000768

Table 4. Summary of Significance of Direct and Indirect Effects for Model in which Association Between Psychosocial Factors and Morphine Analgesic Responsiveness is Mediated by Endogenous Opioid Function.

IV- DV Indirect Effect via Endogenous Opioid Function Bootstrap 95% Confidence Intervals
Direct Effect Lower Upper
BDI – MPQ-Sensory B = -.009 -.083 -.022
BDI – MPQ-Present Pain B = -.029* -.087 -.001
TAI – MPQ-Sensory B = -.013 -.042 -.002
PCS – MPQ-Sensory B = -.016* -.048 -.010
PCS – MPQ-Present Pain B = -.018* -.047 -.002
PDI – MPQ-Sensory B = -.003 -.037 -.009
PDI – MPQ-Present Pain B = -.016* -.027 .002

Note:

*

= p < .05.

Bootstrap 95% confidence intervals that do not contain zero are significant at p<.05. BDI = Beck Depression Inventory; TAI = Trait Anxiety Inventory; PCS = Pain Catastrophizing Scale; PDI = Pain Disability Index; PA = Positive Affect scale; MPQ = McGill Pain Questionnaire.