age.start	age.end	age.group.total	chd.absent	chd.present
20	29	10	9	1
30	34	15	13	2
35	39	12	9	3
40	44	15	10	5
45	49	13	7	6
50	54	8	3	5
55	59	17	4	13
60	69	10	2	8