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. 2006 Aug;63(8):509–512. doi: 10.1136/oem.2005.025379

Table 2 Characteristics of case and non‐case subjects (138 cases and 2595 non‐cases).

Cases Non‐cases Total p ‐value
n (%) n (%) n (%)
Male 132 (95.7) 2418 (93.2) 2550 (93.3) 0.182
Mean (SD) Mean (SD) Mean (SD)
Time since first asbestos exposure (years) 32.1 (8.6) 37.6 (7.1) 37.3 (7.3) <0.001
Time since last asbestos exposure (years) 30.5 (8.7) 36.4 (7.6) 36.1 (7.8) <0.001
Mean (95% CI) Mean (95% CI) Mean (95% CI)
Cumulative asbestos exposure (f/ml‐year)* 9.2 (6.7–12.7) 5.5 (5.1–5.9) 5.7(5.3–6.0) 0.0011
Duration of exposure (days)* 195 (151–253) 139(131–147) 141 (134–149) 0.0086

*Geometric mean.