In this paper,the criteria for confounders in survival function based on the interac-tion under the condition that the covariate is continuous are discussed.When the covariate is one-dimensional,the necessary and sufficient conditions for the uniform non-confounding and uniformly irrelevant factor are obtained by utilizing the potential distribution difference of the covariate between the population and subpopulation.Then the sufficient conditions for the conditional uniform non-confounding and conditional uniformly irrelevant factor vector are also obtained when the covariate is multidimensional.Further,the criteria for detecting a single confounder and multiple confounders in survival function based on the interaction are proposed.
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