Table 1.
Characteristics of Underground Miners and Controls.
| Total | Underground | Controls | P | ||
|---|---|---|---|---|---|
| 72 (N) | 100 (%)a | 72 (N) | 100 (%)a | ||
| Age | |||||
| Median age (IQR) in years | 45.5 | 35-51.8 | 47 | 36-52 | .463 |
| ≤30 | 9 | 12.5 | 8 | 11.1 | |
| 31-40 | 19 | 26.4 | 18 | 25 | |
| 41-50 | 23 | 31.9 | 23 | 31.9 | |
| 51-60 | 21 | 29.2 | 23 | 31.9 | |
| BMI | |||||
| Median BMI (IQR) in kg/m2 | 24 | 22.1-26.4 | 24.6 | 21.8-26.9 | .872 |
| <18.5 | 0 | 0 | 4 | 5.6 | |
| 18.5-23.9 | 36 | 50 | 28 | 38.9 | |
| 24-27.9 | 27 | 37.5 | 29 | 40.3 | |
| ≥28 | 9 | 12.5 | 11 | 15.3 | |
| Smoking Index | |||||
| Median Smoking Index (IQR) in PYS | 13.7 | 0-20.8 | 5 | 0-17.6 | .053 |
| 0 | 19 | 26.4 | 30 | 41.7 | |
| 0-20 | 35 | 48.6 | 30 | 41.7 | |
| 20-30 | 15 | 20.8 | 7 | 9.7 | |
| >30 | 3 | 4.2 | 5 | 6.9 | |
| The first radon exposure age | |||||
| Median first exposure age (IQR) in years | 21 | 18-25.5 | 20 | 18-23 | .102 |
| 15-19 | 24 | 33.3 | 31 | 43.1 | |
| 20-24 | 30 | 41.7 | 30 | 41.7 | |
| ≥25 | 18 | 25 | 11 | 15.3 | |
| Duration of radon exposure | |||||
| Median duration of exposure (IQR) in years | 19.5 | 10-31 | 22.5 | 13-34 | .167 |
| 1-10 | 21 | 29.2 | 14 | 19.4 | |
| 11-20 | 19 | 26.4 | 18 | 25 | |
| 21-30 | 13 | 18.1 | 12 | 16.7 | |
| >30 | 19 | 26.4 | 28 | 38.9 | |
| Radon gas concentration | |||||
| Mean radon gas concentration in Bq/m3 | 7441 | – | 284 | – | .000 |
| Accumulative radon exposure | |||||
| Median accumulative radon exposure (IQR) in WLM | 95 | 48-149 | 4 | 3-7 | .000 |
| Mean accumulative radon exposure (SD) in WLM | 98 | 52 | 5 | 3 | |
| Effective radon exposure dose | |||||
| Median effective exposure dose (IQR) in mSv | 946 | 481-1486 | 44 | 24-66 | .000 |
| Mean effective radon exposure dose (SD) in mSv | 982 | 518 | 48 | 27 | |
Abbreviations: BMI, body mass index; IQR, interquartile range; PYS, pack-years; SD, standard deviation; WLM, working-level month.
a Percentages may not sum to 100 because of rounding.