Table 2.
Ion concentrations as measured by ICP-OES and ISEPs (n = 128) and limits of agreement between the ICP-OES and ISEP measurements
| Ion (n = 128) |
Concentrations | Mean adjusted difference | Adjusted Limits of Agreement | ||
|---|---|---|---|---|---|
| ISEP | ICP-OES | Mean (95% CI) | Lower | Upper | |
| Median (Q1, Q3) (min – max) | Median (Q1, Q3) (min – max) | Mean (95% CI) | Mean (95% CI) | ||
| Na+ (mM) | 7.0 (4.8, 10.8) (2.4–69.6) | 10.7 (8.0, 18.3) (4.7–76.6) | -0.001 (-0.94, 0.94) | -6.12 (-7.75, -4.49) | 6.12 (4.49, 7.75) |
| K+ (mM) | 13.8 (12.3, 15.4) (8.2–21.0) | 21.2 (18.4, 25.2) (8.9–42.6) | 16.5 (15.3, 17.7) | 7.37 (5.82, 9.47) | 25.6 (23.5, 27.7) |
| Na+:K+ ratio | 0.5 (0.4, 0.7) (0.2–8.5) | 0.5 (0.4, 0.7) (0.2–5.3) | -0.01 (-0.02, 0.003) | -0.82 (-0.85, -0.79) | 0.80 (0.77, 0.82) |