Table 1.

Distribution of some key features in 91 female dental personnel under the age of 70 examined neuropsychologically and in the group of 856 female dental personnel from which they were recruited

	Subsample examined neuropsychologically (n = 91)				All women <70 years of age in original study (n = 856)
Feature	Mean	SD	Median	Range	Mean	SD	Median	Range
Age	57.0	6.4	58.0	33	50.5	10.8	52.0	48
Sum of Euroquest symptom scoresa	11.9	3.2	11.2	14.2	11.9	3.2	11.2	14.2
Exposure scorea	947	1,515	730	8,900	515	1084	168	11,245
Urine Hg value in nmol/lb	86.7	86.7	59.8	355	80.6	97.4	55.0	1068
Year of first employmentc	1972	9.1	1971	42	1979	12.5	1977	51
Years of employmentc,d	15.6	7.2	15.0	35.1	13.2	7.7	12.7	36.0

^aRelative scores with no unit.

^b170 measurements available for all from previous survey, and 28 for those examined neuropsychologically in the current study.

^cIn dental health care.

^dBefore 1990 and adjusted for employment fraction.