The percent of specimens with 5% or more hematogones by patient age group.

For this analysis the density gradient separation– and ammonium chloride lysis–processed specimens were combined. There is a direct decline in the proportion of patients with more than 5% marrow hematogones with increasing age. The difference between the combined groups of patients aged less than 16 years with 5% or more hematogones (24.6%) and those 16 and older (6.3%) was significant (P < .000 01).