Metabolite profiling in posttraumatic stress disorder.

4Z,15E-bilirubin IXa, an isomer of bilirubin, contributed to the separation of PTSD cases and controls in the PLS-DA model, but did not reach statistical significance in the univariate approach.

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Multivariate and univariate statistics revealed convergent results, as 12 out of the 13 nominally significant metabolites in the univariate approach were also identified as important predictors of PTSD status by the multivariate approach (Additional file 1 : Table S2).

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