Table 2 Association between distance metrics using recursive partitioning analysis derived cut-points and each breath-hold end point using accuracy, sensitivity and specificity (binary distance metrics) and concordance index and Pearson correlation coefficients (continuous distance metrics). Pearson correlation coefficients calculated using continuous breath-hold end points
Breath-Hold End Points: | Heart V25 Gy ≥ 10 cm3 | Mean Heart Dose ≥1.7 Gy | Maximum LAD Dose ≥28 Gy | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Variables (mm) | Mean ± SD n (%) | Acc | Sens | Spec | C | PCC | Acc | Sens | Spec | C | PCC | Acc | Sens | Spec | C | PCC |
Contact Heart | 78.3 ± 22.8 | – | – | – | 0.76 | 0.31b | – | – | – | 0.87 | 0.32b | – | – | – | 0.84 | 0.49b |
< 73 mm ≥ 73 mm | 18 (36) 32 (64) | 70.0 | 87.0 | 55.6 | – | – | 80.0 | 77.5 | 90.0 | – | – | 82.0 | 81.1 | 84.6 | – | – |
< 50 mma ≥ 50 mma | 5 (10) 45 (90) | 56.0 | 100 | 18.5 | – | – | 82.0 | 95.0 | 30.0 | – | – | 80.0 | 97.3 | 30.8 | – | – |
4th Arch | 32.8 ± 25.5 | – | – | – | 0.86 | 0.57b | – | – | – | 0.97 | 0.61b | – | – | – | 0.91 | 0.55b |
< 7 mm ≥ 7 mm | 11 (22) 39 (78) | 68.0 | 100 | 40.7 | – | – | 94.0 | 95.0 | 90.0 | – | – | 88.0 | 94.6 | 69.2 | – | – |
5th Arch | 58.5 ± 23.4 | – | – | – | 0.68 | 0.12 | – | – | – | 0.82 | 0.16 | – | – | – | 0.76 | 0.40b |
< 41 mm ≥ 41 mm | 9 (19) 39 (81) | 54.0 | 90.9 | 26.9 | – | – | 82.0 | 92.1 | 60.0 | – | – | 78.0 | 91.7 | 50.0 | – | – |