Estimate the survival probability by year for each group? Ophthalmology In Table 14.33, we present data from

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Estimate the survival probability by year 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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