"treat","age_now","pt_yrs","deaths"
1,1,1,0
1,2,1,0
1,3,2,0
1,4,2,0
1,5,1,1
2,1,1,0
2,2,2,0
2,3,3,2
2,4,1,0
2,5,1,0
2,6,1,0