Table 1

 Positive rates of urinary β2-microglobulin and person-years in three observation periods

MenWomen
β2-MG(−)β2-MG(+)Totalβ2-MG(−)β2-MG(+)Total
β2-MG(−), urinary β2-microgrobulin <1000 μg/gCr; β2-MG(+), urinary β2-microgrobulin ⩾1000 μg/gCr; U-Cd, urinary cadmium, which was measured in 1403 men and 1716 women.
*Geometrical mean (geometrical standard deviation).
Subjects (n)1219205142414253291754
(β2-MG positive rate %)14.418.8
U-Cd (mean (SD)* μg/gCr)4.2 (1.8)7.8 (1.9)6.5 (1.8)10.8 (1.8)
Person-years observed
    1981–865320.9828.26149.16287.11378.57665.6
    1987–915242.9604.25847.16449.51103.87553.3
    1992–964310.4408.84719.25527.6706.06233.6
    Total14974.21841.216815.418264.23188.321452.5
Mean observed year/person12.3911.812.89.712.2