PROC PHREG DATA=dat_crr covs(aggregate);
	MODEL (_start_,_stop_)*_censcrr_(0)=age logUosm logProt logCCR pkd bblocker diur logCCR*logstop1/rl;
	logstop1=log(_stop_+1/12);
	ID _id_;
	WEIGHT _weight_;
	HAZARDRATIO logCCR/at(logstop1=-2.49 -0.54 0.08 1.13 1.63);
RUN;