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Table 2 Result of Harris and Boyd test, which was performed to see the need for partitioning of Reference interval based on sex

From: Hematological reference intervals determination in adults at Gondar university hospital, Northwest Ethiopia

Parameters P value Harris and Boyd
Z* Z Decision
WBC (×109/l) 0.3779 3 0.4 No separate RI
Neutrophil (%) 0.7239 3 0.6 No separate RI
Neutrophils absolute (×109/l) 0.6331 3 0.01 No separate RI
Lymphocyte (%) 0.6750 3 0.5 No separate RI
Lymphocytes absolute (×109/l) 0.1705 3 0.9 No separate RI
Mixed (%) 0.5375 3 0.5 No separate RI
Mixed absolute (×109/l) 0.2784 3 0.5 No separate RI
Platelet (×109/l) 0.0223 3 2.3 No separate RI
RBC (×1012/l) 0.0016 3 3.4 Separate RI
Hgb (g/dl) <0.0001 3 5.6 Separate RI
PCV (%) 0.0033 3 3.4 Separate RI
MCH (pg) 0.0016 3 3.1 Separate RI
MCHC (g/dl) <0.0001 3 5.0 Separate RI
MCV (fl) 0.2929 3 0.3 No separate RI
RDW 0.9577 3 0.6 No separate RI
ESR (mm/h) 0.3283 3 0.9 No separate RI
  1. Z = critical value, Z* = calculated value, Separate RI are needed only when Z is greater than Z*, P value is derived from Mann–Whitney U test
  2. Italic values indicate hematological parameters which need partition between male and female (Z > Z*)