4. Assume the below life table was constructed from following individuals who were diagnosed with a slow-progressing form of prostate cancer and decided not to receive treatment of any form. Calculate the survival probability at year 1 using the Kaplan-Meir approach and interpret the results.

Time in Years

Number at Risk, N_t

Number of Deaths, D_t

Number Censored, C_t

Survival Probability

0

20

1

1

20

3

2

17

1

3

16

2

1

A) The probability of surviving 1 year after being diagnosed with a slow-progressing form of prostate cancer is .85.

B) The probability of surviving 1 year after being diagnosed with a slow-progressing form of prostate cancer is .85 for the individuals being followed in this study.

C) The probability of surviving 1 year after being diagnosed with a slow-progressing form of prostate cancer is .85 for individuals who decided against all forms of treatment.

D) The probability of surviving 1 year after being diagnosed with a slow-progressing form of prostate cancer is .85 for the individuals being followed in this study and for individuals who decided against all forms of treatment.