If you have a recent version of SAS/STAT, you could directly use PROC BGLIMM for a full Bayesian analysis.
The text indicated df calculated using the Satterthwaite method. But I have only scanned this.
Obviously, PROC MIXED does not provide direct answer. But you can get it outside of PROC MIXED.
Ask PROC MIXED to save/print var(L'B0) and v_b_hat. Once you have these two items, then you can construct your own interval limits.
Hope trhis helps,
Tianlin Wanhg
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