Table 2 Characteristics of patients in the Training cohort and test cohort
Item | Training cohort (n = 382) | Test cohort (n = 164) | t/U/x2 | P |
|---|---|---|---|---|
Age (years) | Â | Â | 0.308 | 0.095 |
  < 45 | 141 (36.90%) | 64 (39.00%) |  |  |
 45 ≤ age<55 | 146 (38.20%) | 48 (29.30%) |  |  |
  ≥ 55 | 95 (24.90%) | 52 (31.70%) |  |  |
Sex | Â | Â | 0.720 | 0.557 |
 Female | 297 (77.70) | 123 (75.00) |  |  |
 Male | 85 (22.30) | 41 (25.00) |  |  |
TSH | 2.09 (1.30,3.10) | 2.19 (1.26,3.17) | 0.930 | 0.926 |
Tumor size (cm) | Â | Â | 0.941 | 0.427 |
  ≥ 0.65 | 160 (41.90%) | 62 (37.80%) |  |  |
  < 0.65 | 222 (58.10%) | 102 (62.20%) |  |  |
Aspect ratio(A/T) | Â | Â | 0.11 | 0.601 |
  ≥ 1 | 194 (50.80%) | 88 (53.70%) |  |  |
  < 1 | 188 (49.20%) | 76 (46.30%) |  |  |
Capsular invasion | Â | Â | 0.881 | 0.593 |
 Yes | 39 (10.20%) | 20 (12.20%) |  |  |
 No | 343 (89.80%) | 144 (87.80%) |  |  |
Calcification | Â | Â | 0.165 | 0.489 |
 Yes | 238 (62.30%) | 108 (65.90%) |  |  |
 No | 144 (37.70%) | 56 (34.10%) |  |  |
Multifocality | Â | Â | 0.029 | 1.000 |
 Yes | 134 (35.10%) | 58 (35.40%) |  |  |
 No | 248 (64.90%) | 106 (64.60%) |  |  |
HT | Â | Â | 3.019 | 0.780 |
 Yes | 69 (18.10%) | 32 (19.50%) |  |  |
 No | 313 (81.90%) | 132 (80.50%) |  |  |
Nodular goiter | Â | Â | 0.006 | 0.423 |
 Yes | 152 (39.80%) | 72 (43.90%) |  |  |
 No | 230 (60.20%) | 92 (56.10%) |  |  |
CLNM | Â | Â | 0.004 | 1.000 |
 Yes | 114 (29.80%) | 49 (29.90%) |  |  |
 No | 268 (70.20%) | 115 (70.10%) |  |  |