Table 3.
Comparison of different characteristics between benign and malignant group in the training set
| Variables | Benign group (n = 84) | Malignant group (n = 36) | χ2 / z / t value | P value |
|---|---|---|---|---|
| Age (year) | 57.54 ± 7.98 | 61.59 ± 11.96 | - 1.845 | 0.069 a |
| Maximum diameter (mm) | 16.50 (9.25, 31.00) | 31.50 (24.00, 46.25) | - 3.551 | < 0.001 b |
| Sex | 0.404 | 0.525 c | ||
| Male | 16 (57.14%) | 36 (64.29%) | ||
| Female | 12 (42.86%) | 20 (35.71%) | ||
| Smoking | 0.219 | 0.640 c | ||
| Never | 17 (60.71%) | 31 (55.36%) | ||
| Always | 11 (39.29%) | 25 (44.64%) | ||
| Parameters | ||||
| SUVmax | 4.38 (2.78, 5.44) | 9.63 (6.23, 13.23) | - 5.257 | < 0.001 b |
| MTV (ml) | 4.05 (2.33, 6.78) | 14.46 (4.77, 38.82) | - 3.981 | < 0.001 b |
| TLG (g) | 6.29 (1.86, 12.96) | 62.16 (11.33, 155.71) | - 4.602 | < 0.001 b |
| ADC (× 10−3mm2/s) | 1.79 ± 0.19 | 1.42 ± 0.28 | 7.266 | < 0.001 a |
| DDC (× 10−3mm2/s) | 3.00 (2.78, 3.32) | 1.93 (1.57, 2.60) | - 4.261 | < 0.001 b |
| α | 0.48 (0.42, 0.52) | 0.63 (0.50, 0.78) | - 4.251 | < 0.001 b |
| MTRasym(3.5 ppm) (%) | 1.07 (0.35, 1.75) | 2.58 (0.62, 3.87) | - 2.847 | 0.004 b |
SUVmax Maximum standardized uptake value, MTV Metabolic tumor volume, TLG Total lesion glycolysis, ADC Apparent diffusion coefficient, DDC Distributed diffusion coefficient, α Diffusion heterogeneity index, MTRasym (3.5 ppm) Magnetization transfer ratio asymmetry at 3.5 ppm. A represents the Mann–Whitney U test, b represents the chi-square test and c represents the independent samples t-test