Table 3 Analyses by risk factor

Ethnic background

0.000*

   Han

1.0

   Uygur

1.4 (1.1-1.9)

0.004*

   Kazak

1.8 (1.2-2.6)

0.004*

   Mongolian

2.7 (1.7-4.2)

0.000*

   Other

1.3 (0.9-1.7)

0.142

Time of donation of whole blood

0.185

   1

1.0

   2

1.2 (0.9-1.7)

0.291

   3

1.9 (1.1-3.2)

0.021*

   4

1.5 (0.7-3.0)

0.278

   5

3.5 (1.3-9.7)

0.016*

   6

4.6 (1.2-17.8)

0.025*

   7

4.1 (0.8-20.7)

0.089

   8

5.1 (1.1-23.9)

0.040*