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st: survival analysis: given median survival time ± 95% CI, how does one calculate SE, t, or exact p?
Dear Stata users,
I am working with a report of data analyzed using survival analysis.
Specifically, the survival probabilities were calculated using the
Kaplan-Meier method, and the estimated survival distributions were
compared between groups using the log-rank test.
For each group, they report the N, median survival time, and the 95%
CI around the median. (The CIs were not calculated using a simple
1.96 x SE, because the upper and lower CI widths are different from
They also report exact P values, but only for where they get a value
Where the comparison between groups is nonsignificant, they just
My goal is to find the exact P value (which I can get to if I can
first get SE or t).
Would someone know how I can achieve this using Stata or some not-too-
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