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Table 3 Mean and standard deviation of age and asbestos exposure variables at the time of diagnosis/interview for ever exposed males

From: On the proportional hazards model for occupational and environmental case-control analyses

Characteristics Cases Controls
  (n = 1 041) (n = 1 425)
Age at diagnosis / interview (years) 67.0 (10.0) 65.9 (6.3)
Year of birth 1 931.1 (10.0) 1 931.0 (9.3)
Age at first exposure (years) 21.0 (7.1) 22.6 (8.1)
Mean exposure intensity over lifetime (fibers/ml) (a) 0.62 (1.43) 0.21 (0.44)
Total exposure duration (years) 27.8 (12.9) 25.0 (14.1)
Time since last exposure (years) 16.9 (13.4) 17.4 (14.6)
  1. Results from the French case-control study on mesothelioma, 1987–2006.
  2. (a) Measured by the mean index of exposure (MIE).