Table 1

Inclusion and exclusion criteria for study selection based on PICOS

Selection criteriaInclusion criteriaExclusion criteria
PopulationAdults living in mainland ChinaResidents outside mainland China or children or adolescent living in mainland China
InterventionInternal migration (either rural-to-urban, urban-to-rural or rural-to-rural, urban-to-urban)International migration
ComparatorAny population groups, including rural/urban residents or general populationNo eligible comparison group
OutcomeAll types of NCD risk factors, including behavioural, metabolic, environmental)
All types of NCD outcomes (diagnosis, treatment, control)
No NCD risk factors or NCD outcomes
Study designAll study designs except for qualitative study, systematic reviewand commentaryQualitative study, systematic review or commentary
  • NCD, non-communicable disease.