### Mediator model

Call:
glm(formula = bili_bin ~ trt, family = binomial(link = "logit"), 
    data = data)

Coefficients:
            Estimate Std. Error z value Pr(>|z|)
(Intercept)  0.08577    0.38245   0.224    0.823
trt         -0.08577    0.24091  -0.356    0.722

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 382.49  on 275  degrees of freedom
Residual deviance: 382.36  on 274  degrees of freedom
AIC: 386.36

Number of Fisher Scoring iterations: 3

### Outcome model

Call:
MASS::glm.nb(formula = platelet ~ trt + bili_bin + trt:bili_bin, 
    data = data, init.theta = 7.84536718, link = log)

Coefficients:
             Estimate Std. Error z value Pr(>|z|)    
(Intercept)   5.48429    0.09753  56.229   <2e-16 ***
trt           0.09494    0.06102   1.556   0.1197    
bili_bin      0.09973    0.13860   0.720   0.4718    
trt:bili_bin -0.15251    0.08730  -1.747   0.0806 .  
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

(Dispersion parameter for Negative Binomial(7.8454) family taken to be 1)

    Null deviance: 294.66  on 275  degrees of freedom
Residual deviance: 282.37  on 272  degrees of freedom
AIC: 3280.8

Number of Fisher Scoring iterations: 1


              Theta:  7.845 
          Std. Err.:  0.677 

 2 x log-likelihood:  -3270.762 
### Mediation analysis 
              est          se          Z         p        lower      upper
cde  -0.142288731 0.108906168 -1.3065259 0.1913738 -0.355740897 0.07116343
pnde  0.030090423 0.052979075  0.5679681 0.5700566 -0.073746655 0.13392750
tnie  0.006394558 0.018043844  0.3543900 0.7230466 -0.028970726 0.04175984
tnde  0.034738909 0.053738206  0.6464471 0.5179898 -0.070586038 0.14006386
pnie  0.001746071 0.005106238  0.3419487 0.7323895 -0.008261971 0.01175411
te    0.036484981 0.054658491  0.6675080 0.5044477 -0.070643692 0.14361365
pm    0.177912755 0.501670080  0.3546410 0.7228586 -0.805342534 1.16116804
      exp(est) exp(lower) exp(upper)
cde  0.8673708  0.7006541   1.073757
pnde 1.0305477  0.9289070   1.143310
tnie 1.0064150  0.9714449   1.042644
tnde 1.0353494  0.9318476   1.150347
pnie 1.0017476  0.9917721   1.011823
te   1.0371587  0.9317938   1.154438
pm          NA         NA         NA

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

Note that effect estimates can vary over m_cde and c_cond values when interaction = TRUE.