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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Biol Psychol. 2012 Mar 16;91(1):36–41. doi: 10.1016/j.biopsycho.2012.02.020

Table 3.

Simple mediation model of sleep quality on SF-MPQ pain severity through cortisol reactivity AUCI adjusted for covariates (Figure 1).

Effect Coefficient SE t Sig. 95% CI Bias Corrected
c 7.05 2.53 2.79 0.01
a 9.06 3.58 2.53 0.02
b 0.25 0.11 2.22 0.03
c’ 4.83 2.60 1.86 0.07
a × b 2.17 1.32 d (LL = 0.41, UL = 6.16)

Table shows unstandardized coefficients for the mediated effect of group differences in pain severity through group differences in sleep quality.

a

direct effect of IV to mediator;

b

direct effect of mediator on DV;

c

total effect of IV on DV;

c’

direct effect of IV on DV;

a × b

indirect effect of IV on DV through proposed mediator; LL, lower limit; UL, upper limit.

d

A p-value for the indirect effect is not provided because such a p-value is contingent upon a normal distribution of the indirect effect. Given that the product of the a and b path coefficients is always positively skewed, interpretation of this p-value can be misleading.