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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Clin J Pain. 2018 Aug;34(8):739–747. doi: 10.1097/AJP.0000000000000602

Table 3.

Bootstrapped multiple mediation analysis testing the indirect effect of perceived injustice on physical function, pain intensity and opioid use status through pain acceptance and anger.

Path
coefficient		 Bootstrap
SE		 T BC 95% CI
Outcome: Physical function
Path c −.2039 .0510 −3.9987**
Path c1 −.0157 .0616 .2549
Path a1 −.5668 .0465 −12.1799**
Path a2 .5552 .0488 11.3749**
Path b1 .4177 .0555 7.5246**
Path b2 −.0308 .0529 .5815
Specific indirect effects
 a1 × b1 −.2367 .0374 LL=−.3059 UL=−.1698
 a2 × b2 .0171 .0349 LL = −.0476 UL=.0898
Total/overall indirect effect
 a1b1 × a2b2 −.2197 .0459 LL=−.3131 UL=−.3124
Outcome: Pain intensity
Path c .3376 .0513 6.5820**
Path c1 .1977 .0691 2.8608*
Path a1 −.6168 .0445 −13.8708**
Path a2 .5743 .0460 12.4750**
Path b1 −.1902 .0621 −3.0611*
Path b2 .0393 .0600 .6555
Specific indirect effects
 a1 × b1 .1173 .0425 LL= .0344 UL=.2029
 a2 × b2 .0226 .0362 LL = −.0517 UL=.0898
Total/overall indirect effect
 a1b1 × a2b2 .1399 .0517 LL=.0431 UL=.2464
Outcome: Opioid use status
Path c .2430 .1307 1.8602*
Path c1 .0559 .1740 −.1267
Path a1 −.5668 .0465 −12.1779**
Path a2 .5552 .0488 11.3749**
Path b1 −.5062 .1681 −3.0121*
Path b2 .0568 .1557 .3647
Specific indirect effects
 a1 × b1 .2869 .0968 LL= .0994 UL=.4842
 a2 × b2 .0315 .0903 LL = −.1370 UL=.2123
Total/overall indirect effect
 a1b1 × a2b2 .3184 .1286 LL=.0772 UL=.5745

Abbreviations: SE, standard error; CI: Confidence intervals; LL, lower limit; LU, upper limit.

Note. Table shows standardized path coefficients for the total and specific indirect effects. Path c, total effect of perceived injustice on the outcome variable; path c1, direct effect of perceived injustice on outcome variable; path a1, effect of perceived injustice on pain acceptance; path a2, effect of perceived injustice on anger; path b1, effect of pain acceptance on the outcome variable; path b2, effect of anger on outcome variable; path a1xb1, indirect effect of perceived injustice on the outcome variable through pain acceptance; path a2xb2, indirect effect of perceived injustice on the outcome variable through anger; path a1b1xa2b2, total indirect effect of perceived injustice on the outcome variable through pain acceptance and anger. Path coefficients are based on 5,000 bootstraps for the indirect effect. LL and UL CIs were used to determine statistical significance of indirect effects.

**

p < .001.

*

p < .05.