Question

You are conducting a study to determine the effects of chemotherapy on the survival of subjects with pancreatic carcinoma. Subjects are enrolled at diagnosis and treated immediately after staging. You observed 5 subjects for an average of 12 months each before the occurrence of death, loss to follow-up, or study termination; 3 of these subjects die. You observe 10 subjects for an average of 6 months each, and 5 die. You observe 10 subjects for an average of 18 months each, and 7 die. What is the total observation period?

          You are conducting a study to determine the effects of
chemotherapy on the survival of subjects with pancreatic carcinoma.
Subjects are enrolled at diagnosis and treated immediately after
staging. You observed 5 subjects for an average of 12 months each
before the occurrence of death, loss to follow-up, or study
termination; 3 of these subjects die. You observe 10 subjects for
an average of 6 months each, and 5 die. You observe 10 subjects for
an average of 18 months each, and 7 die. What is the total
observation period?

Added by Kevin S.

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