Table 1.
Characteristics of welders who contributed hair samples.
| Characteristic | K (%) | N | mean ± SD (range) |
|---|---|---|---|
| Age (years) | ≥47 (100) | 26.7±9.1 (18.0–56.4) | |
| Body weight (kg) | ≥47 (100) | 83.8±19.2 (56.7–156.5) | |
| Male | 43 (91.5) | ||
| Race | |||
| White | 35 (74.5) | ||
| Black | 6 (12.8) | ||
| Asian | 2 (4.3) | ||
| American Indian | 2 (4.3) | ||
| Other | 2 (4.3) | ||
| Ethnicity | |||
| Non-Hispanic | 43 (91.5) | ||
| Pack-years | 2.8±6.0 (0–36) | ||
| Smoker | |||
| Never | 20 (42.6) | ||
| Current | 16 (34.0) | ||
| Past | 11 (23.4) | ||
| Drinks alcohol | 31 (66.0) | ||
| Time welding/day (min) | 47 | 527 | 312.6±52.9 (66–405) |
| Respirator user | 11 (23.4) | ||
| MnA30d (µg m−3) | 47 | 154 | 13.1±10.2 (0.2–44.7) |
| Acetone wash only | 33 | 98 | 13.8±10.2 (0.2–44.7) |
| Triton X wash only | 27 | 56 | 11.9±10.1 (0.2–32.8) |
| Manganese concentration in hair (µg g−1) | 47 | 154 | 3.9±7.2 (0.1–51.5) |
| Acetone wash only | 33 | 98 | 5.2±8.6 (0.1–51.5) |
| Triton X wash only | 27 | 56 | 1.7±2.1 (0.1–10.6) |
K, number of subjects; N, number of samples.