(a) Binary logistic regression outcomes based on FTR1,FTR2, and FTR1/2 parameters | ||||
---|---|---|---|---|
Models | Odds ratio | p-value | 95% CI for odds ratio | |
Lower | Upper | |||
FTR1 | 1.54 | 0.005* | 1.14 | 2.07 |
FTR2 | 1.65 | 0.01* | 1.13 | 2.42 |
FTR1/2-ground | 33.55 | 0.005* | 2.91 | 386.72 |
FTR1/2-40 cm | 30.55 | 0.005* | 2.78 | 335.73 |
(b) Receiver operating characteristic (ROC) curve analysis and corrected Akaike’s Information Criterion (CAIC) of FTR1, FTR2, and FTR1/2 | ||||
---|---|---|---|---|
FTR1 | FTR2 | FTR1/2-ground | FTR1/2-40 cm | |
AUC | 0.921 | 0.932 | 0.939 | 0.921 |
95% CI for AUC | 0.830 to 1 | 0.845 to 1 | 0.860 to 1 | 0.835 to 1 |
p-value | < 0.0001** | < 0.0001** | < 0.0001** | < 0.0001** |
Overall accuracy | 86.84 | 89.47 | 92.1 | 89.5 |
Sensitivity | 89.29 | 92.9 | 96.43 | 96.43 |
Specificity | 90 | 80 | 80 | 70 |
CAIC | 24.1 | 22.58 | 21.56 | 22.9 |
Optimal cutoff value | ≤ 59.43 | > 21.36 | ≤ 2.83 | ≤ 2.71 |
(c) Cross-validation results | ||||
Error | 15.79 | 21.05 | 10.53 | 13.16 |
Sensitivity | 82.14 | 71.43 | 92.86 | 92.86 |
Specificity | 90 | 88.57 | 80 | 70 |