Table 1. Basic characteristics of patients and nodules.
| Characteristics | Whole group * (n=517) | Benign group * (n=346) | Malignant group * (n=171) | P value @ |
|---|---|---|---|---|
| No. of patients | 498 | 330 | 168 | |
| Age (yr) # | 51.5 ± 12.9 [18-82] | 52.6 ± 13.2 [18-82] | 49.3 ± 12.3 [23-78] | 0.006 |
| Males/females | 107/391 | 78/253 | 29/138 | 0.127 |
| Pattern of nodule | <0.001 | |||
| Non-calcification | 177 (34.2) | 140 (40.5) | 37 (21.7) | |
| Micro-calcification | 159 (30.8) | 94 (27.2) | 65 (38.0) | |
| Macro-calcification | 181 (35.0) | 112 (32.3) | 69 (40.3) | |
| Size (mm) # | 20.1 ± 9.2 [10.0-62.6] | 21.3 ± 10.1 [10.0-62.6] | 17.6 ± 6.5 [10.0-39.2] | <0.001 |
| No. of 10-20 mm | 363 (70.2) | 220 (63.6) | 143 (83.6) | |
| No. of >20 mm | 154 (29.8) | 126 (36.4) | 28 (16.4) | |
| Maximum SWS of nodule # (m/s) | 4.24 ± 2.55 [0.54-8.40] | 3.47 ± 2.16 [0.54-8.40] | 5.81 ± 2.56 [1.17-8.40] | <0.001 |
| Mean SWS of nodule # (m/s) | 3.12 ± 1.84 [0.35-8.40] | 2.29 ± 0.99 [0.35-6.12] | 4.81 ± 2.03 [1.42-8.40] | <0.001 |
| Maximum SWS of surrounding tissue # (m/s) | 2.60 ± 0.80 [0.82-7.64] | 2.56 ± 0.92 [0.82-7.64] | 2.56 ± 0.73 [0.90-5.88] | 0.095 |
| Mean SWS of surrounding tissue # (m/s) | 2.28 ± 0.74 [0.42-6.24] | 2.25 ± 0.76 [0.66-6.24] | 2.31 ± 0.69 [0.42-5.34] | 0.420 |
*
Numbers in parentheses are percentages.
#
Data are means ± standard deviations. Ranges are in brackets.
@
P values of nonparametric variables were determined by Chi-square test, and P values of continuous variables by independent t test.
Abbreviation: SWS, shear-wave speed.