Fig. 2
From: Reference value and annual trend of white blood cell counts among adult Japanese population
Secular trends in average white blood cell counts in peripheral blood of adult male Japanese subjects. Each dot in the figure represents a representative arithmetic mean value in a report. See the text for selection of each represent value. The line in the middle of the figure is a calculated regression line, and two dotted curves on both sides of the line show the 95 % range for the means