Table 2.
Correlation results for the retrospective study, prospective study, and combined data
| Retrospective clinical study | Prospective research study | Total | |
|---|---|---|---|
| Number of acquisitions | 23 | 31 | 54 |
| Linear regression | |||
| Pearson’s correlation coefficient (95% CI) | 0.98 (0.95–0.99) | 0.99 (0.98–1.00) | 0.99 (0.97–0.99) |
| Lin’s concordance coefficient (95% CI) | 0.98 (0.95–0.99) | 0.99 (0.98–1.00) | 0.98 (0.97–0.99) |
| Slope (95% CI) | 0.92 (0.84–1.01) | 0.96 (0.91–1.01) | 0.94 (0.89–0.98) |
| Intercept (95% CI) | 15.9 (− 7.1–38.9) | 7.5 (− 3–17.9) | 11.3 (0.5–22.2) |
| Bland–Altman | |||
|
Mean of differences (95% CI of mean differences) lower and upper limit of agreement |
0.9 (− 13.8–15.6) − 69.6–71.4 |
− 0.4 (− 7–6.3) − 37.2–36.5 |
0.2 (− 7.1–7.4) − 53.0–53.4 |
Shown are correlation coefficients, Lin’s correlation coefficient for all study groups, the slope and interception as well as the mean of differences and the limit of agreement from the Bland–Altman analysis with their 95% confidence intervals (CI)