Table 6 Categorization of cumulative exposure variables (μg/L –months) within the Camp Lejeune cohort
Category | Reference level | Low exposure | Medium exposure | High exposure |
|---|---|---|---|---|
Cumulative tetrachloroethylene (for >1 μg/L –months: mean = 402.6, median = 269.5) | ||||
Level* | ≤ 1 | >1 - 155 | >155 - 380 | >380 – 8,585 |
Number (%) | 66, 582 (43.0%) | 28,230 (18.2%) | 27,255 (17.6%) | 32,865 (21.2%) |
Cumulative trichloroethylene (for >1 μg/L –months: mean = 6,369.3, median = 5,289.0) | ||||
Level* | ≤ 1 | >1 – 3,100 | >3,100 – 7,700 | >7,700 – 39,745 |
Number (%) | 64, 584 (41.7%) | 31,069 (20.1%) | 27,638 (17.8%) | 31,641 (20.4%) |
Cumulative vinyl chloride (for >1 μg/L –months: mean = 458.9, median = 360.6) | ||||
Level* | ≤ 1 | >1 - 205 | >205 - 500 | >500 – 2,800 |
Number (%) | 66, 470 (42.9%) | 27,651 (17.8%) | 28,063 (18.1%) | 32,748 (21.1%) |
Cumulative benzene (for ≥2 μg/L –months: mean = 104.7, median = 83.2) | ||||
Level* | < 2 | 2 - 45 | >45 - 110 | >110 - 601 |
Number (%) | 64, 580 (41.7%) | 24,579 (15.9%) | 31,838 (20.5%) | 33,935 (21.9%) |
Cumulative TVOC (for >1 μg/L –months: mean = 9,605.1, median = 7,652.8) | ||||
Level* | ≤ 1 | >1 – 4,600 | >4,600 – 12,250 | >12,250 - 64,016 |
Number (%) | 57, 328 (37.0%) | 35,432 (22.9%) | 29,687 (19.2%) | 32,485 (21.0%) |