Results
The age distribution of the sawmill workers is shown in Table 1. The age range was between
15 and 80 years, with a mean age of 38.9 years (SD 12.8). The mean age of the technical workers (38.2 years, SD 12.7) was significantly higher (P = 0.015) than the mean age of the administrative workers (41.6 years, SD 12.8).