Skip to main content

Table 6 Categorization of cumulative exposure variables (μg/L –months) within the Camp Lejeune cohort

From: Evaluation of mortality among marines and navy personnel exposed to contaminated drinking water at USMC base Camp Lejeune: a retrospective cohort study

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%)
  1. *An individual’s maximum amount of cumulative exposure (μg/L –months) at the end of follow-up.
  2. N = 154,932.