Meta-analyses of associations between socioeconomic status and progression of psychological and cognitive multimorbidities in participants with a new-onset physical condition including study-specific findings. (A) Progression to physical-psychological multimorbidity; (B) progression to physical-cognitive multimorbidity; (C) progression to physical-psychological-cognitive multimorbidity. The models were adjusted for age and sex. sHR, subdistribution hazard ratio; CI, confidence interval; HRS, US Health and Retirement Study; ELSA, English Longitudinal Study on Ageing; SHARE, Survey of Health, Ageing and Retirement in Europe; CHARLS, China Health and Retirement Longitudinal Study; KLoSA, Korean Longitudinal Study of Aging.