Table 3 Interaction of conventional risk... | American Society of Hematology

Table 3

Interaction of conventional risk categories and leukocyte count (multivariable model)

Risk factors	Hazard ratio (95% CI)
Low risk and low WBC count	1 (Reference)
Low risk and high WBC count*	3.1 (1.4-7.1)
High risk† and low WBC count	2.5 (1.0-6.0)
High-risk† and high WBC count*	5.0 (2.1-11.9)

Risk factors	Hazard ratio (95% CI)
Low risk and low WBC count	1 (Reference)
Low risk and high WBC count*	3.1 (1.4-7.1)
High risk† and low WBC count	2.5 (1.0-6.0)
High-risk† and high WBC count*	5.0 (2.1-11.9)

White blood cell count greater than 8.7 × 10⁹/L.

Aged 60 years or older and/or previous thrombotic event.