Table 2.
Left atrial volumes with intra-observer and inter-observer reproducibility of LAV-CAC.
| Left atrial volumes⁎ | ||||
|---|---|---|---|---|
| LAV CAC (mL) |
LAV CCTA (mL) |
Correlation coefficient | ICC; 95%CI | |
| Reader 1 (TH) | 74.3 ± 24.2 | 71.0 ± 24.6 | 0.954 (p < 0.001) |
0.947; 0.909–0.968 (p < 0.001) |
| Reader 2 (AC) | 71.7 ± 22.2 | 71.2 ± 20.8 | 0.944 (p < 0.001) |
0.941; 0.895–0.967 (p < 0.001) |
| Intra-observer reproducibility# | ||||
|---|---|---|---|---|
| LAV CAC (mL) Time 1 |
LAV CAC (mL) Time 2 |
Correlation coefficient | ICC; 95%CI | |
| Reader 1 (TH) | 75.5 ± 23.3 | 71.2 ± 23.9 | 0.968 (p < 0.001) |
0.951; 0.818–0.980 (p < 0.001) |
| Reader 2 (AC) | 71.7 ± 22.2 | 73.1 ± 21.1 | 0.989 (p < 0.001) |
0.989; 0.980–0.994 (p < 0.001) |
| Inter-observer reproducibility# | ||||
|---|---|---|---|---|
| Reader 1, LAV CAC, mL | Reader 2, LAV CAC, mL | Correlation coefficient | ICC; 95%CI | |
| LAV CAC | 72.9 ± 24.5 | 71.6 ± 22.1 | 0.97 (p < 0.001) |
0.958; 0.937–0.972 (p < 0.001) |
Reader 2 (AC) performed 100 LAV-CAC measurements and 50 LAV-CCTA measurements (at time 1, one to three weeks apart). For this table, only values for the 50 matched subjects are shown for reader 2.
Descriptive statistics is based on readings (performed at time 1, one-three week apart) of 100 measurements by reader 1 (TTH) both for LAV-CAC and LAV-CCTA.
To assess intra-observer reproducibility of LAV-CAC, absolute agreement intra-class correlation analysis was performed on 65 and 48 randomly selected repeated readings of LAV-CAC by reader 1 (TTH) and reader 2 (AC), respectively. To assess inter-observer reproducibility of LAV-CAC, two-way mixed intra-class correlation agreement analysis was performed on 100 randomly selected readings (either time 1 or time 2 readings) of LAV-CAC by reader 1 (TTH) and reader 2 (AC).