Table 1.

Demographic and laboratory data by the Duffy phenotype among healthy individuals identifying as Black or African American at a single primary care center

	Duffy non-null (n = 40)	Duffy-null (n = 80)	P value
Median age (IQR), y	50 (37-59)	51 (41-60)	.53
Median ANC (IQR), cells per μL	5 005 (3 675-5 828)	2820 (2088-3490)	<.001
Mean ANC (range), cells per μL	4 972 (2 360-10 500)	2907 (1080-5950)	—
ANC <2000 cells per μL, n (%)	0 (0)	19 (23.8%)	<.001
ANC <1500 cells per μL, n (%)	0 (0)	8 (10.0%)	—

IQR, interquartile range.

Bold indicates statistical signficance.