Table 2.
Results of Bland and Altman analysis and correlation between invasive and noninvasive blood pressure for the standing and the anesthetized group
| Bias (mmHg) | LLA (mmHg) | ULA (mmHg) | R | P | |
|---|---|---|---|---|---|
| Standing group: all phases combined (n = 8) | |||||
| Systolic BP | 30.0 | −18.8 | 78.7 | 0.84 | <0.001 |
| Diastolic BP | 8.9 | −25.5 | 43.3 | 0.84 | <0.001 |
| Mean BP | 16.4 | −16.1 | 48.9 | 0.88 | <0.001 |
| Standing group: hypotensive phase (n = 7) | |||||
| Systolic BP | 15.9 | −0.4 | 32.2 | 0.58 | 0.18 |
| Diastolic BP | 8.4 | −9.8 | 26.6 | 0.45 | 0.31 |
| Mean BP | 10.5 | −5.1 | 26.1 | 0.58 | 0.17 |
| Standing group: normotensive phase (n = 8) | |||||
| Systolic BP | 26.8 | −2.1 | 51.4 | 0.85 | 0.01 |
| Diastolic BP | 10.2 | −15.3 | 35.6 | 0.72 | 0.05 |
| Mean BP | 15.3 | −9.6 | 40.1 | 0.78 | 0.02 |
| Standing group: hypertensive phase (n = 7) | |||||
| Systolic BP | 57.2 | −10.9 | 125.3 | 0.30 | 0.51 |
| Diastolic BP | 6.8 | −54.1 | 67.6 | 0.10 | 0.83 |
| Mean BP | 25.0 | −29.8 | 79.7 | 0.37 | 0.42 |
| Anesthetized group: all phases combined (n = 8) | |||||
| Systolic BP | 3.3 | −13.3 | 19.8 | 0.92 | <0.001 |
| Diastolic BP | 0.6 | −22.8 | 24.0 | 0.76 | <0.001 |
| Mean BP | 0.5 | −22.3 | 23.2 | 0.81 | <0.001 |
| Anesthetized group: <65 mmHg phase (n = 6) | |||||
| Systolic BP | 3.0 | −11.6 | 17.6 | 0.59 | 0.22 |
| Diastolic BP | 2.1 | −16.7 | 21.0 | 0.26 | 0.61 |
| Mean BP | 2.3 | −17.8 | 22.4 | 0.28 | 0.59 |
| Anesthetized group: 65–90 mmHg phase (n = 8) | |||||
| Systolic BP | 3.3 | −9.8 | 16.4 | 0.79 | 0.02 |
| Diastolic BP | 0.0 | −24.1 | 24.2 | −0.20 | 0.64 |
| Mean BP | 0.4 | −20.6 | 21.3 | −0.18 | 0.67 |
| Anesthetized group: >90 mmHg phase (n = 6) | |||||
| Systolic BP | 3.5 | −20.8 | 27.8 | 0.81 | 0.05 |
| Diastolic BP | −0.2 | −30.2 | 29.8 | 0.46 | 0.35 |
| Mean BP | −1.2 | −31.5 | 29.0 | 0.68 | 0.14 |
LLA, Lower limit of agreement; ULA, upper limit of agreement; P, probability level; R, Pearson correlation coefficient.