In cox regression categorical levels not shown in my output

In my data, Hemoglobin_group is a categorical variable with 6 levels. When I run the below code, I can't see Hemoglobin_group levels in the output. How can I solve this problem?

fit <- coxph(Surv(Time,Status)~Hemoglobin_group, data)  fit  

My output:

                      coef   exp(coef) se(coef)  z        p      Hemoglobin_group -0.06585  0.93627  0.01874 -3.514 0.000441  

https://stackoverflow.com/questions/65762723/in-cox-regression-categorical-levels-not-shown-in-my-output January 17, 2021 at 11:49PM