Table 7

Multivariate Subgroup Analysis

Covariates

Relative risk (95%CI)

Rank group

(reference "middle rank")

High and higher rank

0.39 (0.24–0.62)

Age at employment

(reference 15–25 years)

25–29 years

0.91 (0.66–1.26)

> = 30 years

2.38 (1.36–4.15)

Year of employment

(reference 1950–54)

1955–1959

0.98 (0.56–1.71)

1960–1964

0.77 (0.37–1.58)

1965–1969

0.57 (0.25–1.27)

1970–2000

0.46 (0.14–1.57)

Duration of employment

(reference 0–5 years)

5–<10 years

2.43 (0.93–6.34)

10–<20 years

0.89 (0.46–1.74)

20–<30 years

0.35 (0.20–0.62)

> = 30 years

0.42 (0.23–0.75)

Early retirement

(reference all others)

Early retirees

1.71 (1.18–2.50)

Wagner et al. Environmental Health: A Global Access Science Source 2006 5:27   doi:10.1186/1476-069X-5-27