A hybrid expert approach for retrospective assessment of occupational exposures in a population-based case-control study of cancer

Table 1 Selected characteristics of the PROtEuS, Lung, and Multisite cancer studies

	PROtEuS	Multisite cancer study	Lung cancer study (male subjects)
Number of subjects¹	4013	4263	1661
Cases	1966 (49.0%)	3730 ²	762 (45.9%) ³
Controls	2047 (51.0%)	533	899 (54.1%)
Years conducted	2005–2012	1979–1986	1996–2001
Number of jobs	16,065	15,067	6881
Blue-collar ⁴	9239 (57.5%)	11,468 (76.1%)	5381 (78.2%)
White-collar ⁵	6826 (42.5%)	3597 (23.9%)	1500 (21.8%)
Period covered by jobs	1943–2012	1920–1986	1934–1999
Number of agents evaluated	313	293	289

1. The PROtEuS and Multisite cancer studies included only male subjects. The Lung cancer study included both male and female subjects; only figures pertaining to male subjects are reported in the table
2. Cases covered 19 different cancer sites
3. Includes 24 mesothelioma cases
4. Jobs in 4-digit CCDO unit groups classified as skilled, semiskilled, unskilled and farming occupations in the Pineo et al. socioeconomic classification [21]
5. Jobs in 4-digit CCDO unit groups classified as professionals, management, technicians, supervisors and foremen in the Pineo et al. socioeconomic classification [21]

ISSN: 1476-069X