Differences for Cases and Controls

Low	Pair	Lwt_d	Smoke_d	Ptd_d	Ht_d	UI_d
1	1	-34	1	1	0	0
1	2	17	0	0	0	1
1	3	35	0	0	0	0
1	4	27	1	1	0	1
1	5	-12	0	0	0	0