Homework #6: Life Tables

Homework #6: Life Tables - Epi 420: Session 13 INTRODUCTION...

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Epi 420: Session 13 Life Tables Example and Exercise Session 13: Life Tables Page 1 of 4 INTRODUCTION TO LIFE TABLES EXAMPLE: BASIC DATA: SURVIVAL STUDY IN TEN PATIENTS WITH LUNG CANCER Patient ID Date of Dx (mm/yy) Date of Last Contact Vital Status as of 01/01/1996 1 02/90 07/94 Dead 2 05/90 02/92 Unknown 3 09/90 12/95 Alive 4 04/91 06/92 Dead 5 04/92 02/96 Alive 6 05/92 01/96 Alive 7 08/92 06/94 Unknown 8 03/93 08/93 Dead 9 04/93 09/95 Dead 10 04/94 12/95 Alive
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Epi 420: Session 13 Life Tables Example and Exercise Session 13: Life Tables Page 2 of 4
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Epi 420: Session 13 Life Tables Example and Exercise Session 13: Life Tables Page 3 of 4 The Life Table Column Headings, Part 1: COUNTS Interval Number who enter interval alive Number who die in the interval Number withdrawn Number alive at Midpoint 1st year 10 1 0 10 – (½ * 0) = 10.0 2 nd year 9 1 3 9 – (½ * 3) = 7.5 3 rd year 5 1 0 5 – (½ * 0) = 5.0 4 th year 4 0 2 4 – (½ * 2) = 3.0 5 th year 2 1 0 2 – (½ * 0) = 2.0 Interval - this defines the length of the time window we are examining. The intervals do not have to be of equal size but the size of the interval should be small enough that the risk of the event should be constant within the interval. Number who enter the interval alive
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Homework #6: Life Tables - Epi 420: Session 13 INTRODUCTION...

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