Table 2.

Multinomial logistic regression analysis of association of sex, age at diagnosis, and MPN-specific mutation with presenting phenotype ET vs PMF

Variable	ET vs PMF
	RR	95% CI	P
Male sex	3.2	2.12-4.93	<.001
Age at diagnosis, y	1.05	1.04-1.07	<.001
MPN-specific mutation
JAK2 +	Ref
CALR +	1.05	0.63-1.76	.855
MPL +	0.79	0.26-2.43	.686
Triple-negative	2.16	0.99-4.76	.051
JAK2– others not done	1.09	0.27-4.39	.760