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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Clin J Pain. 2019 Jul;35(7):569–576. doi: 10.1097/AJP.0000000000000711

Table 4.

Summary of Direct and Indirect Effects for Models in which Associations Between Sleep Disturbance and Functional Outcomes Are Mediated by Chronic Pain Intensity.

Bootstrap 95% Confidence Intervals forIndirect Effects
Outcome Mediator Direct Effect of Sleep Disturbance Lower Upper
Rand 36-Physical Function MPQ-Sensory p < .001 −0.587  0.002
MPQ-Affective p < .001 −0.626 −0.029
VAS Intensity p < .001 −0.866 −0.203
Rand 36-Social Function MPQ-Sensory p = .004 −0.827 −0.062
MPQ-Affective p = .006 −0.960 −0.220
VAS Intensity p = .008 −0.861 −0.130
Rand 36-Physical Role Limitations MPQ-Sensory p = .004 −0.929 −0.005
MPQ-Affective p = .005 −1.081 −0.208
VAS Intensity p = .013 −1.239 −0.107
Rand 36-Emotional Role Limitations MPQ-Sensory p = .001 −0.819  0.215
MPQ-Affective p = .004 −1.038 −0.087
VAS Intensity p = .005 −0.968  0.066

Note: Each row represents a unique analysis testing a single mediator. Bootstrap 95% confidence intervals that do not contain zero are significant at p<.05 (in bold). MPQ = McGill Pain Questionnaire–Short Form (Past Month)