Table 1

Numbers and percentages of workers ever exposed to asbestos, and agreement (Cohen's κ) between self-reports and DOM-JEM assessment approach, Greater Toronto Area, Ontario, 1997–2001

Self-reportsDOM-JEM
No of workersn%n%*κ
Overall†1335826.119414.80.19
Level of exposure
 Low‡17613.40.16
 High§181.40.22
Lung cancer status
 Cases425317.39723.20.12
 Controls910515.69710.90.25
  Population controls405245.95413.30.26
  Hospital controls505275.3438.50.24
Sex
 Men5806811.715126.30.20
 Women755141.9435.80.05
Occupation group¶
 Professional/technical600152.591.50.07
 Construction691724.63753.60.30
 Blue collar excluding construction399379.715639.10.06
 Other**972161.6192.00.15
Duration of employment (years)††
 1–101180474.015012.90.18
 11–20482214.4469.50.22
 >20338185.33410.30.16
Decade of job termination‡‡
 <194011121.81213.80.10
 1940–194914321.42417.60.11
 1950–195927893.23412.30.05
 1960–1969385174.44411.60.22
 1970–1979512173.3428.30.24
 1980–1989693243.5598.70.28
 >19901035272.6747.30.15
  • *Denominators used to calculate proportions exposed differ for self-reports and DOM-JEM assessment because of incomplete occupation information.

  • †No DOM-JEM assessments available for 22 individuals because of incomplete occupation information.

  • ‡Agreement between classification of ‘exposed’ versus ‘unexposed’ according to self-reports and ‘ever employed in a job with low exposure and never employed in a job with high exposure’ versus ‘unexposed’ according to DOM-JEM.

  • §Agreement between classification of ‘exposed’ versus ‘unexposed’ according to self-reports and ‘ever employed in a job with high exposure’ versus ‘unexposed’ according to DOM-JEM.

  • ¶Individuals may be counted in more than one category.

  • **Includes administrative, managerial, clerical, sales, service, agricultural and related workers.

  • ††Duration of employment missing for 49 individuals; individuals may be counted in more than one category.

  • ‡‡Year of job termination missing for 94 individuals; individuals may be counted in more than one category.

  • DOM-JEM, general population job-exposure matrix.