Suppose a pharmaceutical company developed a new drug called Andrex for the treatment of pancreatic cancer. In a clinical trial, 550 patients were randomized to receive treatment with either Andrex or the current standard of care, a drug called Balivir. The patients were subsequently followed for 8 years and their survival experiences were compared by treatment group. Given the results depicted in the image below, which of the following statements is most accurate?( Choose one answer per question )
1-
The median survival for the Balivir group was 15%
The median survival for the Balivir group was 7 years
The median survival for the Andrex group was 95%
The median survival for the Andrex group was 7 years
2-
The probability of dying by 8 years was greater for the Andrex group than the Balivir group
The probability of dying by 8 years was greater for the Balivir group than the Andrex group
The probability of dying by 8 years was the same for the Andrex and Balivir groups
The probability of dying by 8 years was not comparable for the Andrex and Balivir groups
3-
Patients in the Andrex group who survived 4 years had a 90% probability of dying by year 5
Patients in the Andrex group had a 90% probability of dying by 5 years
Patients in the Andrex group who survived 4 years had a 90% probability of surviving to year 5
Patients in the Andrex group had a 90% probability of surviving 5 years
4-
The cumulative 8-year survival rate for the Andrex group was better than for the Balivir group
The cumulative 8-year survival rate for the Balivir group was better than for the Andrex group
The cumulative 8-year survival rates for the Andrex and Balivir groups were the same
The cumulative 8-year survival rates for the Andrex and Balivir groups are not comparable
5-
From year 6 to year 7 a greater percent of patients in the Andrex group survived than in the Balivir group
From year 6 to year 7 a greater percent of patients in the Balivir group survived than in the Andrex group
From year 6 to year 7 the percent of patients that survived was the same in the Balivir and Andrex groups
From year 6 to year 7 the percent of patients that survived was not comparable for the Balivir and Andrex groups
6-In two sentences or less, identify which treatment group had a better overall survival experience and briefly explain why.
7-In three sentences or less, identify which type of analysis of observed survival was used to produce the survival curves and briefly explain why. Use the attachment for this question if needed to see the methods