[Age and sex dependent distribution pattern and normal range of blood cell parameters obtained by automated blood...

Distribution and normal value of 23 blood cell parameters in healthy 2509 males and 1658 females (20-69 year of age) who are the visitors of our health examination clinic or workers of the hospital were studied. These parameters were obtained by automated cell analyzer (Sysmex NE-8000, Toa Med. Electronics). Distribution pattern and normal range of 23 parameters were studied in different groups of the sex and the age (decade). Distribution of the parameters in each groups was classified into 5 patterns such as Gaussian (G), log-Gaussian (L), skewed toward lower values (P1), skewed toward higher values with shorter tail than of log-Gaussian (P2), skewed toward higher values with longer tail than of log-Gaussian (P3). Normal range of parameters in each groups was calculated by mean +/- 1.96SD of normal distribution curve obtained by power transformation procedure in L, P1, P2 and P3 distribution. Parameters concerning leukocytes and platelets showed rarely G distribution in each groups. Significant sex difference was observed in leukocyte count (male > female, p < 0.001) and platelet count (female > male, p < 0.01) in each age group. Normal values of newly analysed parameters as volume distribution curve of erythrocytes and platelets, mean platelet volume and large platelet ratio were established.