Associations between socioeconomic inequalities and progression to psychological and cognitive multimorbidities after onset of a physical condition: a multicohort study.

Individuals with lower SES also had an increased risk of progressing from PP-MM to PPC-MM (sHR = 1.39, 1.25–1.56) and from PC-MM to PPC-MM (sHR = 1.24, 1.09–1.41), although sHRs did not reach statistical significance for some SES groups.

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