Figure 3. Bland and Altman plots showing mean percentage difference (bold blue lines) and limits of agreement (mean difference ± 1.96 standard deviations (SD), dotted red lines) for the (A) < 16 x 10⁶/ml, (B) 16 to 40 x 10⁶/ml, (C) 40 to 80 x 10⁶/ml and (D) > 80 x 10⁶/ml subdivisions of sperm concentration estimated with Neubauer hemocytometer (NH) and Makler chamber (MC).