Harmonization of job histories across cohorts

The overall objective of the EPHOR mega cohort is to evaluate occupational risk factors and the occurrence or severity of major NCDs over the life course, including cancers, respiratory, cardiovascular, metabolic and neurodegenerative diseases and musculoskeletal and mental disorders, as well as multimorbidity and work participation. The EPHOR mega cohort is currently comprised of 29 participating cohort studies (though new cohorts may join). The purpose of this mega cohort occupational variable harmonisation protocol is to provide a protocol for harmonisation of occupational variables in each participating cohort for participation in mega cohort analyses related to Job title and EuroJEM defined exposure.