Differences for Cases and Controls 1 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