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Table 1 Asbestos exposure and other risk factors in the study group (n =187)

From: Is it useful to combine sputum cytology and low-dose spiral computed tomography for early detection of lung cancer in formerly asbestos-exposed power industry workers?

  Mean SD Range
Age (years) 65.8 5.8 46 – 78
Time since first exposure (years) 40.4 7.8 26 – 60
Duration of asbestos exposure (years) 29.5 7.7 15 – 49
Pack years 44.7 47.9 0 – 118