Issues with Quantile Regression Output at Different Quantiles

[bhr-q]

I want to compare the median of a continuous variable  b/n two groups using quantile regression, as you see below, when I set the quantile to 0.75, I receive output that includes p-values and difference estimates table. However, adjusting the quantile to 0.5 does not yield the second table with these details. Could you please advise on how to address this issue?

here is my code:

proc quantreg data=both_MIS ci=resampling;
class trtgroup;
model LOS_hours = trtgroup/ quantile=0.5 ;
estimate 'Diff in Medians' trtgroup 1 -1 / CL;
run;

Thanks