libname NH "C:\NHANES\DATA";

data demo_4yr;
	set NH.demo (keep=seqn sddsrvyr ridstatr ridpreg sdmvpsu sdmvstra wtmec4yr riagendr ridageyr ridreth1 )
	    NH.demo_b (keep=seqn sddsrvyr ridstatr ridpreg sdmvpsu sdmvstra wtmec4yr riagendr ridageyr ridreth1);
data bpx_4yr;
	set NH.bpx (keep=seqn bpxsy1-bpxsy4 bpxdi1-bpxdi4)
	    NH.bpx_b (keep=seqn bpxsy1-bpxsy4 bpxdi1-bpxdi4);

data bpq_4yr;
	set NH.bpq  (keep=seqn bpq010 bpq020 bpq030 bpq050a bpq070 bpq080 bpq100d)
	    NH.bpq_b (keep=seqn bpq010 bpq020 bpq030 bpq050a bpq070 bpq080 bpq100d);

data mcq_4yr;
	set NH.mcq (keep=seqn mcq160b mcq160c mcq160d mcq160e mcq160f)
	    NH.mcq_b (keep=seqn mcq160b mcq160c mcq160d mcq160e mcq160f);

data lab13_4yr;
	set NH.lab13 (keep=seqn lbxtc)
	    NH.l13_b (keep=seqn lbxtc);
run;