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(a) Mean difference serum potassium (K) vs average serum potassium (K) values by Flame Photometer and Synchron Cx9 PRO (Bland and Altman Plot) 95% limits of agreement = mean difference ± 2 SD [1.23, -1.73] (b) Mean difference serum sodium (Na) vs average serum sodium (Na) values by Flame Photometer and Synchron Cx9 PRO (Bland and Altman Plot) 95% limits of agreement =mean difference ± 2 SD [26, -41.73]
