Table 3.

Hazards ratio (95% confidence interval) for new thrombosis in patients with Chuvash erythrocytosis.

Baseline values	Hazards ratio (univariate)	P	Hazards ratio (multivariate*)	P	Hazards ratio (multivariate)**	P
Erythropoietin (IU/L; natural log)	1.69 (1.23-2.33)	0.001	1.71 (1.25-2.34)	0.0008	1.59 (1.11-2.28)	0.011
Hematocrit (%)	0.97 (0.94-1.01)	0.21	0.99 (0.94-1.03)	0.51	0.98 (0.94-1.02)	0.41
Ferritin (μg/L; natural log)	1.37 (.925-2.03)	0.12	1.08 (0.73—1.61)	0.70	1.25 (0.83—1.88)	0.29
Transferrin (mg/ml)	0.28 (0.15-0.53)	0.0009	0.28 (0.12- 0.63)	0.002	0.29 (0.19- 0.71)	0.007

^*Erythropoietin, hematocrit, ferritin, and transferrin are all included in the model.

^**Additionally adjusted for age at baseline, past history of phlebotomy, and past history of thrombosis.