Variable

b

SE (b)

P value

OR

95% confidence interval of OR

Upper limit

lower limit

Wash red blood cell suspension

1.173

0.522

0.025

3.231

1.246

10.056

No fever before blood transfusion; fever after blood transfusion

2.200

0.626

<0.001

9.026

3.054

38.743

Fever before blood transfusion

0.444

0.335

0.186

1.559

0.816

3.054