Table 3.
Findings of the comparative statistics analyzing the FVP and IGP measurement agreement.
| No. of Measurements | IGP [mmHg] | FVP [mmHg] | r2 | Bias [mmHg] | Precision [mmHg] | LOA [mmHg] | Percentage Error [%] | Mean Absolute Percentage Error (SD) [%] | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Median [Range] | ||||||||||
| Overall Result | 660 | 7.0 (2.4–16.5) | 7.0 (1.0–23.0) | 0.13 | −0.8 | 4.4 | −9.6–8.0 | 117 | 55 (47) | |
| Explorative additional examination: influenceability by right cardiac valve insufficiency | ||||||||||
| Echo- findings | No TI, no PI and no PHT | 48 | 5.7 (4.0–10.9) | 3.0 (1.0–13.0) | 0.13 | 2.1 | 2.3 | −2.5 to 6.7 | 90 | 41 (29) |
| Mild TI, mild PI and no PHT | 271 | 7.0 (2.5–16.5) | 10.0 (1.0–23.0) | 0.10 | −2.2 | 4.2 | −10.6 to 6.2 | 102 | 62 (50) | |
| Mild to moderate TI and/or PI and/or PHT | 120 | 6.8 (3.5–12.9) | 10.0 (1.0–19.0) | 0.47 | −1.8 | 3.6 | −9.0 to 5.4 | 91 | 50 (27) | |
| No Echo findings available | 221 | 7.1 (2.4–14.2) | 5.0 (1.0–21.0) | 0.06 | 0.8 | 4.6 | −8.4 to 10.0 | 135 | 52 (53) | |
| Exploratory additional examination: influenceability by the height of intra-abdominal pressure (IAP) | ||||||||||
| IAP [mmHg] | <7 | 189 | 5.2 (2.4–6.9) | 3.0 (1.0–6.0) | 0.01 | 1.7 | 1.9 | −2.1 to 5.5 | 88 | 42 (25) |
| 7–9 | 189 | 7.8 (3.5–9.8) | 7.0 (1.0–9.0) | 0.08 | 1.6 | 3.1 | −4.6 to 7.8 | 93 | 40 (27) | |
| 10–12 | 162 | 7.8 (2.7–12.6) | 11.0 (2.0–12.0) | 0.15 | −2.3 | 3.6 | −9.5 to 4.9 | 80 | 57 (43) | |
| 13–15 | 83 | 8.3 (3.9–14.2) | 14.0 (7.0–15.0) | 0.02 | −5.2 | 2.7 | −10.6 to 0.2 | 49 | 76 (49) | |
| 16–18 | 23 | 8.4 (3.7–12.9) | 17.0 (16.0–18.0) | 0.05 | −8.5 | 2.9 | −14.3 to −2.7 | 46 | 123 (80) | |
| >16 | 14 | 8.0 (3.8–16.5) | 19.0 (19.0–23.0) | 0.05 | −11.5 | 3.2 | −17.9 to −5.3 | 46 | 170 (99) | |
Abbreviations: FVP: femoral vein pressure; IGP: intra-gastric 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.