Table 1 Comparison of Solute concentrations between Dialysate obtained from CCS and PPC
CCS | 95% CI | PPC | 95% CI | Tolerance limits | |
|---|---|---|---|---|---|
Study duration, weeks | 4 | – | 4 | – | – |
Number of HD machines n | 16 | – | 16 | – | – |
Number of measurements per HD machine | 8 | – | 8 | – | – |
Total number of measurements | 128 | – | 128 | – | – |
Sodium | |||||
Nominal concentration N, mmol/L | 140 | – | 140 | – | – |
E(Mi | k) Mean observed concentration ± SD, mmol/L | 136.82 ± 2.54 | 136.13, 137.51 | 136.62 ± 2.47 | 135.78, 137.45 | 133 to 147 |
E(\( \overline{\varepsilon i} \) | k) Mean absolute deviation from nominal ± SD, mmol/L | 3.38 ± 2.26 | 2.85, 3.91 | 3.49 ± 2.31 | 2.71, 4.27 | ±7.0 |
E(\( \overline{ri} \) | k) Mean relative deviation from nominal ± SD, % | −2.27 ± 1.81 | −2.76, −1.78 | −2.42 ± 1.76 | −3.01, −1.82 | ± 5% |
Maximum absolute deviation from nominal, mmol/L | 12 | – | 14 | – | – |
Number of observed concentration exceeded allowed tolerance limit | 5 | – | 5 | – | – |
Chloride | |||||
Nominal concentration N, mmol/L | 106.5 | – | 106.5 | – | – |
E(Mi | k) Mean observed concentration ± SD, mmol/L | 104.96 ± 2.23 | 104.46, 105.46 | 105.27 ± 2.04 | 104.72, 105.82 | 101.17 to 111.82 |
E(\( \overline{\varepsilon i} \) | k) Mean absolute deviation from nominal ± SD, mmol/L | 2.10 ± 1.69 | 1.73, 2.47 | 1.79 ± 1.56 | 1.38, 2.19 | ±5.3 |
E(\( \overline{ri} \) | k) Mean relative deviation from nominal ± SD, % | −1.43 ± 2.09 | −1.90, −0.97 | −1.15 ± 1.91 | −1.67, −0.63 | ± 5% |
Maximum absolute deviation from nominal, mmol/L | 9.5 | – | 10.5 | – | – |
Number of observed concentration exceeded allowed tolerance limit | 5 | – | 3 | – | – |
Bicarbonate | |||||
Nominal concentration N, mmol/L | 35 | – | 35 | – | – |
E(Mi | k) Mean observed concentration ± SD, mmol/L | 35.47 ± 1.83 | 35.23, 35.71 | 35.41 ± 1.99 | 35.02, 35.81 | 33.25 to 36.75 |
E(\( \overline{\varepsilon i} \) | k) Mean absolute deviation from nominal ± SD, mmol/L | 1.58 ± 1.02 | 1.30, 1.87 | 1.77 ± 0.98 | 1.59, 1.95 | ±1.7 |
E(\( \overline{ri} \) | k) Mean relative deviation from nominal ± SD, % | 1.36 ± 5.23 | 0.68, 2.04 | 1.18 ± 5.68 | 0.05, 2.31 | ± 5% |
Maximum absolute deviation from nominal, mmol/L | 3 | – | 3 | – | – |
Number of observed concentration exceeded allowed tolerance limit | 64 | – | 71 | – | – |