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Table 2. 

Statistical Tests for Neural Activity Mediation of Testosterone and Unfair Offer Rejection

Region (BA)
A
B
C
C′
Indirect Effect (Lower Limit 95% CI, Upper Limit 95% CI)
Medial orbitofrontal cortex (11) (−16, 56, −8, t = 3.65, k = 153) −0.55* −0.42* 0.35* 0.12 7.79* (1.23, 15.71) 
Medial orbitofrontal cortex (11) (16, 50, −6, t = 3.34, k = 56) −0.45* −0.41* 0.35* 0.17 6.00* (.40, 12.89) 
Region (BA)
A
B
C
C′
Indirect Effect (Lower Limit 95% CI, Upper Limit 95% CI)
Medial orbitofrontal cortex (11) (−16, 56, −8, t = 3.65, k = 153) −0.55* −0.42* 0.35* 0.12 7.79* (1.23, 15.71) 
Medial orbitofrontal cortex (11) (16, 50, −6, t = 3.34, k = 56) −0.45* −0.41* 0.35* 0.17 6.00* (.40, 12.89) 

Parameter estimates were extracted from a conjunction analysis in which unfair offer rejection rate and testosterone were independently regressed on the unfair > fair contrast map. Testosterone levels were standardized within sex. Mediation tests are based on Shrout and Bolger (2002) and Baron and Kenny (1986). (A) Regression slope of testosterone predicting neural activity; (B) regression slope of neural activity predicting rejection of unfair offers, controlling for testosterone; (C) regression slope of testosterone predicting rejection of unfair offers; (C′) regression slope of testosterone predicting rejection of unfair offers, controlling for neural activity. Bootstrapping was used to estimate indirect effects (Shrout & Bolger, 2002; see also Preacher & Hayes, 2004). A confidence interval that does not overlap with zero indicates statistically significant mediation. CI = confidence interval.

*Indicates statistically different from zero, p < .05.

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