Table 2
Mean (SD) characteristics of the participants in the study groups
No of cases
Age
Years of smoking
Years of exposure
Controls
350
70.0 (8.8)
16.6 (18.1)
33.1 (11.6)
PMF
350
70.1 (8.9)
16.0 (18.8)
33.1 (11.7)