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Figure 1: Comparison of Kova and improved Neubauer for sperm concentration measurement. A total of 60 different sperm concentrations were measured with the two methods. (a) Bland–Altman plot of difference in the concentration (10^{6} ml^{−1}) measured with Kova chamber and improved Neubauer hemocytometer against the mean of the 2 values (circles). The solid line represents the mean of differences. The dotted lines indicate the 95% confidence limits (mean ± 1.96 × s.d.). (b) Linear regression of the logtransformed concentrations (10^{6} ml^{−1}) estimated with Kova chamber 10 (yaxis) and improved Neubauer hemocytometer (xaxis). The solid line represents the Tessier's linear regression (X_{K} = 0.95X_{N} + 0.94). 
