(1) Interval since Beginning Treatment x 1st year 2nd year 3rd year 4th year 5th year (2) Alive at Beginning of Interval 1000 742 612 501 203 (3) Died during Interval 258 100 103 295 107 (4) Withdrew during Interval 0 30 8 3 12 Risk of Dying during Interval: Col (Col 1000 727 608 499.5 197 Who Died during Interval: Col (3) Col (5) .258 .138 .169 .591 .543 Who Did Not Die during Interval: 1 -Col (6) .742 .862 .831 .409 .457 from Enrollm to End of Interval: Cumulativc Survival .742 .640 .532 .217 How many people were enrolled in this study? 100 o 1 ooo o 84 o 12 O 99+