Figure 4).

Bland-Altman plots of mean differences versus mean values of per cent neutrophil cell counts show the agreement between samples processed by the two different methods. A Per cent neutrophil cell counts from aliquots from the same sample processed by the routine and formaldehyde preservation methods. B Per cent neutrophil cell counts from aliquots from the same sample processed by the routine and alcohol preservation methods. The solid line represents the mean difference (see also Tables 1 and 2), the dotted lines indicate ±1.96 SDs from the mean (ie, 95% CIs)