Table 3.

Summary results of study groups, cohorts, and studies stratified by exposure category

Exposure category* (definitions)	Study groups	Cohorts	Studies	Exposed workers	UHg levels (µg/L) mean (range)†	Duration (yrs) mean (range)†
HIGH  (≥200 µg/L)	n=21	n= 20‡	n= 20	n = 1065	447 (3–7100)	7.1 (0.25–40)
MEDIUM (100 – 199 µg/L)	n=11	n= 9	n = 7	n = 581	145 (2–819)	7.8 (0.08–30)
LOW  (50 – 99 µg/L)	n=12	n= 10	n = 8	n = 915	66 (6–1200)	6.9 (0.03–37)
BEI   (<50 µg/L)	n=14	n= 10	n = 10	n = 604	23 (0.3–121)	11.2 (0.03–45)
Summary Totals:	n =58	n =49	n =45	3165	189 (0.3–7100)	8.4 (0.08 – 45)

Key:

^*= Exposure categories used to stratify workers according to their group mean U_Hg levels (see text for details).

^†= Presents weighted average of group mean U_Hg levels (or exposure durations), and overall range of individual U_Hg levels (or exposure durations) among study groups within each exposure category.

^‡= Includes Albers cohort that was evaluated using a nested case-control design.