“…The following major groups of occupations were used: managers (ISCO code 1), professionals (2), technicians and associate professionals (3), clerical support workers (4), services and sales workers (5), skilled agricultural, forestry and fishery workers (6), craft and related trades workers (7), stationary plant and machine operators and assemblers (8), and elementary occupations (including occupations in the armed forces) (9,0). In addition, professionals were divided into health professionals (ISCO subcode 22), teaching professionals (23) and other professionals (21,24,25,26). Technicians and associate professionals were divided into health associate professionals (32) and other associate professionals (31,33,34,35).…”