data serum1;
input group n1 percent1 n2 percent2;
length cat $20.;
if group=1 then cat="< 1.2";
if group=2 then cat=">= 1.2 to < 2.02";
if group=3 then cat=">= 2.02 to < 5.35";
if group=4 then cat=">= 5.35";
cards;
1 13 60 4 20
2 12 50 3 18
3 16 75 8 40
4 14 65 6 33
;
run;