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Partial least squares discriminant analysis (PLS−DA) and partial orthogonal discriminant analysis (OPLS−DA) of urine samples from workers exposed to environmental and occupational benzene, analyzed by UHPLC−ESI−Q−ToF−MS. Note: Red triangles represent samples from the occupational group and the green squares represent samples from the environmental group. (A): PLS−DA model, validation parameters: R2 = 0.98, Q2 = 0.87; (B): OPLS−DA model.
