### Mediator model

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

Residuals:
    Min      1Q  Median      3Q     Max 
-3.4000 -2.5000 -1.7000  0.4434 24.3000 

Coefficients:
            Estimate Std. Error t value Pr(>|t|)  
(Intercept)   2.2132     0.8784   2.520   0.0123 *
trt           0.7434     0.5532   1.344   0.1801  
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

Residual standard error: 4.594 on 274 degrees of freedom
Multiple R-squared:  0.006548,	Adjusted R-squared:  0.002923 
F-statistic: 1.806 on 1 and 274 DF,  p-value: 0.1801

### 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  0.05406559 0.0417549  1.2948322 0.1953781 -0.02777251 0.1359037 1.0555538
tnde -0.13775153 0.2247503 -0.6129092 0.5399364 -0.57825405 0.3027510 0.8713152
pnie  0.05406559 0.0417549  1.2948322 0.1953781 -0.02777251 0.1359037 1.0555538
te   -0.08368595 0.2264461 -0.3695624 0.7117086 -0.52751206 0.3601402 0.9197201
pm   -0.60295125 1.8172532 -0.3317926 0.7400458 -4.16470205 2.9587996        NA
     exp(lower) exp(upper)
cde   0.5608768   1.353577
pnde  0.5608768   1.353577
tnie  0.9726096   1.145572
tnde  0.5608768   1.353577
pnie  0.9726096   1.145572
te    0.5900712   1.433530
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.