Table 3.
Participant demographic information by mine
| Mine | Workers (N)∗ | Age (Mean/yrs) | Age (SD/yrs) | Mining experience (Mean/yrs) | Mining experience (SD/yrs) | Mobile PDS experience (Median/yrs) |
|---|---|---|---|---|---|---|
| A | 19 | 40.21 | 9.16 | 10.84 | 6.87 | 1-2 |
| B | 23 | 43.23 | 9.79 | 19.59 | 11.20 | 1-2 |
| C | 18 | 35.94 | 12.70 | 10.42 | 12.88 | >1 |
| D | 44 | 41.05 | 12.69 | 14.77 | 12.36 | 1-2 |
| E | 20 | 40.45 | 10.36 | 10.98 | 8.58 | >1 |
| F | 67 | 40.94 | 10.68 | 12.93 | 8.97 | 1-2 |
| G | 17 | 35.94 | 10.31 | 11.30 | 9.18 | >1 |
| All workers | 208 | 40.23 | 11.10 | 13.30 | 10.42 | 1-2 |
PDS, proximity detection system; SD, standard deviation.
∗
Owing to the inclusion of cases with missing data, reported values for age, experience, and mobile PDS may not be based on the total number of workers at the mine or in the study.