Interpret the survival curves given below estimate the median survival time in the two groups being compared.In your opinion, does the median

Interpret the survival curves given below

estimate the median survival time in the two groups being compared. In your opinion, does the median survival time differ substantially between the 2 groups? Why or why not?

1 resected PM

median survival time = _________________

> 1 resected PM

median survival time = _________________

Comparison of median survival times

No questions below line information only

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CASE INFO- INFORMATIONAL ONLY:

A study was conducted to identify prognostic factors of improved survival after resection of isolated pulmonary metastases (PM) from colorectal cancer. Data were collected for 77 patients who underwent a complete resection during the first thoracic operation. The variables in the data set are given below

VARIABLES:

subj:                           Subject number

number:                    Number of resected pulmonary metastases (nominal variable)

                                   categorized as “>1” or “1”

months:                     Survival in Months

status_2:                    Vital status at end of study

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