Table 4.

Multivariable Cox proportional hazards model for the prediction of arterial thrombosis.

Covariate	HR (95% CI)	P-value
Male sex	0.74 (0.48–1.15)	0.183
Age ≥65 years	1.82 (1.17–2.82)	0.007
Previous arterial event	1.88 (1.18–2.99)	0.007
Previous venous event	0.96 (0.51–1.83)	0.911
At least one CV risk	1.65 (1.00–2.72)	0.052
Aspirin	1.07 (0.67–1.69)	0.787
Phlebotomy	0.88 (0.57–1.37)	0.567
Hydroxyurea	0.85 (0.56–1.31)	0.465

HR hazard ratio, CI confidence interval, CV cardiovascular.