Table 1.
Clinical factors of the training, validation and external sets
| Characteristics | Training set (n = 146) | Validation set (n = 65) | External test set (n = 101) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Metastasis(n = 100) | Myeloma (n = 46) |
P | Metastasis (n = 44) |
Myeloma (n = 21) |
P | Metastasis (n = 52) |
Myeloma (n = 49) |
P | |
| Age (year) | 60.0 ± 11.2 | 59.8 ± 10.1 | 0.910 | 60.3 ± 10.4 | 61.1 ± 11.4 | 0.766 | 62.1 ± 12.8 | 64.4 ± 8.4 | 0.287 |
| Gender (male/female) | 60/40 | 26/20 | 0.692 | 27/17 | 14/7 | 0.679 | 32/20 | 32/17 | 0.694 |
| Diameter (cm) | 2.1 ± 1.0 | 1.7 ± 1.5 | 0.044 | 2.4 ± 1.6 | 1.6 ± 0.9 | 0.032 | 2.2 ± 0.9 | 1.5 ± 0.7 | < 0.001 |
|
Margin (well-defined/ill-defined) |
63/37 | 22/24 | 0.840 | 29/15 | 11/10 | 0.294 | 28/24 | 33/16 | 0.166 |
| Heterogeneous appearance (present/absent) | 76/24 | 22/24 | 0.001 | 36/8 | 10/11 | 0.005 | 39/13 | 38/11 | 0.763 |
| Shape (regular/irregular) | 17/83 | 22/24 | < 0.001 | 6/38 | 12/9 | 0.001 | 15/34 | 7/45 | 0.037 |
| Number of lesions (single/multiple) | 8/92 | 5/41 | 0.572 | 4/40 | 3/18 | 0.527 | 5/47 | 4/45 | 0.798 |
Continuous variables are presented as mean± standard deviation, categorical data as numbers (n)