grp	Pre	Post	Followup
1	19	6	1
1	28	14	16
1	18	6	8
1	999	6	11
1	21	6	13
1	24	10	8
1	26	10	999
1	15	6	13
1	18	8	6
1	34	13	8
1	20	999	999
1	34	10	1
1	29	16	23
1	33	19	39
1	22	7	16
2	20	5	0
2	999	999	21
2	36	26	17
2	25	11	9
2	26	999	7
2	30	31	10
2	19	6	11
2	19	7	999
2	22	4	999
2	22	17	20
2	24	19	1
2	28	22	16
2	29	23	20
2	27	15	20
2	27	7	3
3	12	14	18
3	27	18	9
3	24	999	13
3	33	21	11
3	26	20	18
3	18	20	26
3	38	35	34
3	26	22	999
3	23	10	8
3	22	19	19
3	34	999	999
3	22	15	12
3	27	18	13
3	23	21	19
3	26	18	14