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📸 Log-Rank test in GraphPad Prism: Survival analysis menu
What Is the Log-Rank Test?
The log-rank test (Mantel-Cox test) compares two or more Kaplan-Meier survival curves to determine whether the groups have statistically different survival distributions. It is non-parametric and considers the entire follow-up period, weighting all time points equally.
Use log-rank when you want to test for an overall group difference. Use Cox regression when you need to adjust for covariates or estimate hazard ratios.
Running Log-Rank in GraphPad
📸 Log-rank test results — significant difference between survival curves
APA Reporting
A log-rank test indicated that survival curves differed significantly between treatment groups, χ²(1)=8.42, p=.004. Median survival was 18.4 months (95% CI [15.2, 21.6]) for Treatment A vs. 11.2 months (95% CI [8.4, 14.0]) for Treatment B.
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