### Mediator model

Call:
lm(formula = bili ~ trt, data = data)

Residuals:
    Min      1Q  Median      3Q     Max 
-2.6050 -1.8125 -1.2587  0.0875 25.0950 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)  
(Intercept)   1.5200     0.8489   1.791   0.0749 .
trt           0.6925     0.5336   1.298   0.1959  
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 3.735 on 194 degrees of freedom
Multiple R-squared:  0.008607,	Adjusted R-squared:  0.003496 
F-statistic: 1.684 on 1 and 194 DF,  p-value: 0.1959

### Outcome model

Call:
glm(formula = spiders ~ trt + bili, family = poisson(link = "log"), 
    data = data)

Coefficients:
            Estimate Std. Error z value Pr(>|z|)    
(Intercept) -1.31796    0.28845  -4.569 4.90e-06 ***
trt         -0.11479    0.18729  -0.613     0.54    
bili         0.06061    0.01253   4.836 1.33e-06 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

(Dispersion parameter for poisson family taken to be 1)

    Null deviance: 198.14  on 275  degrees of freedom
Residual deviance: 187.85  on 273  degrees of freedom
AIC: 353.85

Number of Fisher Scoring iterations: 5

### Mediation analysis 
             est        se          Z         p       lower     upper  exp(est)
cde  -0.13775153 0.2247503 -0.6129092 0.5399364 -0.57825405 0.3027510 0.8713152
pnde -0.13775153 0.2247503 -0.6129092 0.5399364 -0.57825405 0.3027510 0.8713152
tnie  0.05036496 0.0401825  1.2534053 0.2100582 -0.02839129 0.1291212 1.0516548
tnde -0.13775153 0.2247503 -0.6129092 0.5399364 -0.57825405 0.3027510 0.8713152
pnie  0.05036496 0.0401825  1.2534053 0.2100582 -0.02839129 0.1291212 1.0516548
te   -0.08738658 0.2263094 -0.3861377 0.6993947 -0.53094484 0.3561717 0.9163228
pm   -0.53787218 1.5640889 -0.3438885 0.7309301 -3.60343003 2.5276857        NA
     exp(lower) exp(upper)
cde   0.5608768   1.353577
pnde  0.5608768   1.353577
tnie  0.9720080   1.137828
tnde  0.5608768   1.353577
pnie  0.9720080   1.137828
te    0.5880491   1.427853
pm           NA         NA

Evaluated at:
avar: trt
 a1 (intervened value of avar) = 2.3
 a0 (reference value of avar)  = 1.1
mvar: bili
 m_cde (intervend value of mvar for cde) = 1.4
cvar: 
 c_cond (covariate vector value) = 

Note that effect estimates do not vary over m_cde and c_cond values when interaction = FALSE.