Table 1. Sampling distribution of high nickel exposure in groups with different lengths of service.

Years of Service	Age group (years)
	20–24	25–29	30–34	35–39	40–44	45–49	50 and older
0–	20	—	—	—	—	—	—
5–	—	20	—	—	—	—	—
10–	—	—	20	—	—	—	—
15–	—	—	—	20	—	—	—
20–	—	—	—	—	20	—	—
25–	—	—	—	—	—	20	—
30+	—	—	—	—	—	—	20