Like @SteveDenham mentioned, you can create a new variable indicating which type the response is, turn the data into a long format and fit a model accordingly. Please note that there is only one MODEL statement allowed in PROC MIXED, and only one response variable in the MODEL statement to be specified.
Here is an example to show you this approach:
subject height weight gender
1 165 56 F
2 180 76 M
....
data two;
set one;
response=height;
type='Height';
output;
response=weight;
type='Weight';
output;
drop height weight;
run;
Then use Response as your dependent variable in the MODEL statement, and include TYPE as one of your effect in the MODEL statement.
In your case, the values for TYPE would be your original response variables.
Hope this helps,
Jill
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