Biostatistics

762 CHAPTER 14 SURVIVAL ANALYSIS
Subject Time a (Years) Status b Subject Time a (Years) Status b (Continued)
11 2 mtc 38 9 alive
12 2 mtc 39 10 alive
13 2 alive 40 11 mtc
14 2 alive 41 11 doc
15 3 mtc 42 12 mtc
16 3 mtc 43 12 doc
17 3 alive 44 13 mtc
18 4 mtc 45 14 alive
19 4 alive 46 15 alive
20 4 alive 47 16 mtc
21 4 alive 48 16 alive
22 5 alive 49 16 alive
23 5 alive 50 16 alive
24 5 alive 51 17 doc
25 5 alive 52 18 mtc
26 6 alive 53 19 alive
27 6 alive
a Time is number of years after surgery.
b doc ¼ dead of other causes; mtc ¼ dead of medullary thyroid cancer.
source: Data provided courtesy of Dr. Massimo E. Dottorini.
14.3.2 Banerji et al. (A-3) followed non–insulin-dependent diabetes mellitus (NIDDM) patients from onset
of their original hyperglycemia and the inception of their near–normoglycemic remission following
treatment. Subjects were black men and women with a mean age of 45.4 years and a standard
deviation of 10.4. The following table shows the relapse/remission experience of 62 subjects.
Calculate the survival function using the Kaplan–Meier procedure and plot the survival curve.
Total
Duration of
Remission
(Months)
Remission
Status a
Total
Duration of
Remission
(Months)
Remission
Status a
Total
Duration of
Remission
(Months)
Remission
Status a
3 1 8 2 26 1
3 2 9 2 27 1
3 1 10 1 28 2
3 1 10 1 29 1
3 1 11 2 31 2
4 1 13 1 31 1
4 1 16 1 33 2
4 1 16 2 39 2
5 1 17 2 41 1
5 1 18 2 44 1
5 1 20 1 46 1
5 1 22 1 46 2
5 1 22 2 48 1
5 1 22 2 48 2