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Construction of quasi-paired cohort by propensity score matching. (A) Samples were matched by propensity score matching with caliper = 0.25 and ratio = 2 based on their metabolic background profiles. (B) The distribution of propensity score before/after matching. (C) Sample proportion based on propensity score before/after matching. (D) Covariate balance of the metabolic background principal components before/after matching.
