Table 1:

Baseline clinical and laboratory characteristics for entire myelofibrosis cohort, subdivided based on primary and secondary myelofibrosis

	Primary Myelofibrosis n=46 (71%)	Secondary Myelofibrosis n=19 (29%)	P-value
Age	70	65.5	0.35
Sex
Male	29	11	0.70
Female	17	8
Group 5 PH	8	6	0.21
WBC	4.7	13.3	0.001
Hgb	9.9	9.9	0.79
Platelets	159	209	0.27
Constitutional Symptomsa	4 (n=38)	4 (n=16)	0.17
Transfusion Requirement	15 (n=39)	2 (n=16)	0.06
Circulating Blast Cells ≥1%a	7 (n=40)	6 (n=17)	0.14
JAK 2 Statusb	14( (n=35)	12 (n=15)	0.009

^a-Sample size (n) limited by incomplete data entry in the electronic medical record

^b-Sample size limited based on availability of ordered test and/or results