Early Effects of Long-Term Neurotoxic Lead Exposure in Copper Works Employees

Table 1

Statistically significant performance difference between lead-exposed subjects (E) involving the subgroups of high exposed (hE) and low exposed (lE), and controls (C) in the tapping test and in the single-choice reaction task.

Test performance	Exposed (E)	Controls (C)	High exposed (hE)	Low exposed (lE)	𝑃 (E-C)	𝑃 (hE-C)	𝑃 (lE-C)
Tapping
FRQ1 (frequency 1. Half of test) (Hz)	5.42±0.69	5.78±0.64	5.42±0.56	5.42±0.74	.030	.056	.049
Single form visual reaction test
GES (total time) (ms)	444.2±68.1	398.4±39.1	446.0±73.8	443.5±66.4	<.001	.012	<.001
INT (initiation time) (ms)	330.3±42.8	306.0±26.5	327.1±44.9	331.6±42.3	.001	.047	.002
MOV (movement time) (ms)	112.4±35.4	91.4±21.6	115.7±35.4	111.0±35.6	.001	.009	.004