b0           -1.3107    
b_base        0.8824    
b_trt        -0.9250    
b_base_trt    0.3345    
b_age         0.4701    
b_visit      -0.2702    
k             0.1344   
log_s2u1     -0.7695    
log_s2u2     -3.4839