Univariate analysis for factors associated with conclusive and inconclusive results on CNB
| Study Outcomes | Conclusive | Inconclusive | P Value |
|---|---|---|---|
| Age (mean) (yr) | 51.2 ± 12.6 | 48.5 ± 12.2 | <.001 |
| Sex (M/F) | 440:1653 | 44:293 | .032 |
| Nodule size (mm) | 14.2 ± 9.4 | 15.4 ± 10.3 | .064 |
| <10 mm | 788 (88.7%) | 100 (11.3%) | .450 |
| ≥10 mm | 1305 (87.7%) | 183 (12.3%) | |
| Composition (No.) (%) | |||
| Solid | 1336 (87.4%) | 192 (12.6%) | .186 |
| Predominantly solid | 95 (84.8%) | 17 (15.2%) | .274 |
| Predominantly cystic | 99 (84.6%) | 18 (15.4%) | .234 |
| Cystic | 4 (66.7%) | 2 (33.3%) | .154 |
| Shape (No.) (%) | |||
| Ovoid to round | 2033 (87.9%) | 279 (12.1%) | .156 |
| Irregular | 60 (93.8%) | 4 (6.3%) | |
| Orientation (No.) (%) | |||
| Parallel | 1728 (87.5%) | 247 (12.5%) | .047 |
| Nonparallel | 365 (91.0%) | 36 (9.0%) | |
| Margin (No.) (%) | |||
| Smooth | 1360 (85.6%) | 228 (14.4%) | <.001 |
| Spiculated | 366 (94.6%) | 21 (5.4%) | <.001 |
| Ill-defined | 367 (91.5%) | 34 (8.5%) | .020 |
| Echogenicity (No.) (%) | |||
| Isoechoic | 767 (88.5%) | 100 (11.5%) | .667 |
| Hypoechoic | 913 (86.0%) | 149 (14.0%) | .004 |
| Markedly hypoechoic | 402 (92.6%) | 32 (7.4%) | .001 |
| Hyperechoic | 11 (84.6%) | 2 (15.4%) | .662 |
| Calcification (No.) (%) | |||
| None | 1456 (87.8%) | 202 (12.2%) | .533 |
| Macrocalcification | 321 (88.2%) | 43 (11.8%) | .950 |
| Microcalcification | 316 (89.3%) | 38 (10.7%) | .459 |
| Location (No.) (%) | |||
| Upper/lower | 1100 (87.6%) | 156 (12.4%) | .417 |
| Mid | 993 (88.7%) | 127 (11.3%) |