Table 4.
Findings of the comparative statistics analyzing the FVP and IVP measurement agreement.
| No. of Measurements | IVP [mmHg] | FVP [mmHg] | r2 | Bias [mmHg] | Precision [mmHg] | LOA [mmHg] | Percentage Error [%] | Mean Absolute Percentage Error (SD) [%] | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Median [Range] | ||||||||||
| Overall Result | 459 | 6.0 (1.0–16.0) | 5.0 (1.0–22.0) | 0.14 | 0.5 | 4.2 | −7.9 to 8.9 | 133 | 51 (55) | |
| Exploratory additional examination: influenceability by right cardiac valve insufficiency | ||||||||||
| Echo- findings | No TI, no PI and no PHT | 48 | 5.0 (3.0–12.0) | 3.0 (1.0–13.0) | 0.02 | 1.5 | 2.6 | −3.7 to 6.7 | 108 | 37 (32) |
| Mild TI, mild PI and no PHT | 117 | 6.0 (1.0–16.0) | 5.0 (1.0–22.0) | 0.30 | −0.4 | 4.0 | −8.4 to 7.6 | 123 | 56 (60) | |
| Mild to moderate TI and/or PI and/or PHT | 73 | 6.0 (2.0–11.0) | 6.0 (1.0–19.0) | 0.48 | −0.7 | 3.3 | −7.3 to 5.9 | 103 | 46 (35) | |
| No Echo findings available | 221 | 6.0 (3.0–14.0) | 5.0 (1.0–21.0) | 0.04 | 0.2 | 4.7 | −9.2 to 9.6 | 145 | 54 (61) | |
| Exploratory additional examination influenceability by the height of intra-abdominal pressure (IAP) | ||||||||||
| IAP [mmHg] | <7 | 203 | 5.0 (1.0–6.0) | 3.0 (1.0–6.0) | 0.06 | 1.3 | 1.8 | −2.3 to 4.9 | 87 | 38 (42) |
| 7–9 | 153 | 7.0 (3.0–9.0) | 6.0 (1.0–9.0) | 0.08 | 1.6 | 3.0 | −4.4 to 7.6 | 94 | 30 (40) | |
| 10–12 | 49 | 8.0 (3.0–12.0) | 10.0 (2.0–12.0) | 0.45 | −1.1 | 4.7 | −10.5 to 8.3 | 107 | 64 (62) | |
| 13–15 | 27 | 8.0 (4.0–15.0) | 14.0 (12.0–15.0) | 0.01 | −5.0 | 2.8 | −10.6 to 0.6 | 50 | 73 (50) | |
| 16–18 | 16 | 8.0 (4.0–9.0) | 17.0 (16.0–18.0) | 0.00 | −9.9 | 1.8 | −13.4 to −6.3 | 30 | 152 (73) | |
| >16 | 11 | 6.0 (4.0–16.0) | 19.0 (19.0–22.0) | 0.68 | −12.2 | 2.5 | −17.2 to −6.7 | 37 | 199 (93) | |
Abbreviations: FVP: femoral vein pressure; IVP: intra-vesical pressure (bladder pressure); r2: Spearman’s correlation coefficient; mean bias: difference between 2 measurements; precision: SD of the mean bias; LOA: limits of agreement; percentage error: Quotient of LOA and mean IAP; Echo: Echocardiography; TI: tricuspid regurgitation; PI: pulmonary regurgitation; PHT: pulmonary hypertonia; IAP intra-abdominal pressure.