Obtain a 95% CI for the survival probability at year 6 for each group? Ophthalmology In Table

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Obtain a 95% CI for the survival probability at year 6 for each group?


Ophthalmology

In Table 14.33, we present data from the RP clinical trial described in Example 14.30 (on page 813) concerning effect of high-dose vitamin E (400 IU/day) vs. low-dose vitamin E (3 IU/day) on survival (where failure is loss of at least 50% of initial ERG 30 Hz amplitude).

Table 14.33 Number of patients who failed, were censored, or survived by year in the 400 IU vitamin E group and 3 IU vitamin E group, respectively, RP clinical trial

 Fail Censored Survive Total 400 IU of vitamin E daily 0-1 уг 1-2 yr 2-3 уг 3-4 yr 4-5 уг 5-6 уг 3 170 180 159 17

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