Table 2 Baseline characteristics of attempted lymph nodes only and after inclusion of unattempted accessible lymph nodes
Attempted LNs | Including unattempted accessible LNs | |||||||
|---|---|---|---|---|---|---|---|---|
Total | True negative | False negative | P | Total | True negative | False negative | P | |
(n = 1737) | (n = 1659) | (n = 78) | (n = 1747) | (n = 1659) | (n = 88) | |||
Nodal station | 0.004 | 0.001 | ||||||
7 | 617 (35.5) | 584/617 (94.7) | 33/617 (5.3) | 622 (35.6) | 584/622 (93.9) | 38/622 (6.1) | ||
4R | 558 (32.1) | 525/558 (94.1) | 33/558 (5.9) | 562 (32.2) | 525/562 (93.4) | 37/562 (6.6) | ||
4L | 408 (23.5) | 403/408 (98.8) | 5/408 (1.2) | 408 (23.4) | 403/408 (98.8) | 5/408 (1.2) | ||
2R | 118 (6.8) | 114 (96.6) | 4/118 (3.4) | 119 (6.8) | 114/119 (95.8) | 5/119 (4.2) | ||
5 | 12 (0.7) | 10 (83.3) | 2/12 (16.7) | 12 (0.7) | 10/12 (83.3) | 2/12 (16.7) | ||
8 | 8 (0.5) | 7 (87.5) | 1/8 (12.5) | 8 (0.5) | 7/8 (87.5) | 1/8 (12.5) | ||
1R | 6 (0.3) | 6/6 (100) | 0/6 (0) | 6 (0.3) | 6/6 (100) | 0 | ||
9 | 5 (0.3) | 5/5 (100) | 0/5 (0) | 5 (0.3) | 5/5 (100) | 0 | ||
3 | 3 (0.2) | 3/3 (100) | 0/3 (0) | 3 (0.2) | 3/3 (100) | 0 | ||
2L | 2 (0.1) | 2/2 (100) | 0/2 (0) | 2 (0.1) | 2/2 (100) | 0 | ||
Node size, mm | ||||||||
Short axis | 7.9 ± 2.8 | 7.8 ± 2.8 | 8.6 ± 3.5 | 0.065 | 7.9 ± 2.8 | 7.8 ± 2.8 | 8.6 ± 3.4 | 0.058 |
Long axis | 12.0 ± 4.9 | 12.0 ± 4.9 | 13.1 ± 5.7 | 0.084 | 12.0 ± 4.9 | 12.0 ± 4.9 | 13.0 ± 5.5 | 0.058 |
Number of aspiration per node | 1.6 ± 0.7 | 1.6 ± 0.7 | 1.7 ± 0.8 | 0.142 | 1.6 ± 0.7 | 1.6 ± 0.7 | 1.6 ± 1.0 | 0.474 |
Obtained core tissue per node | 1.4 ± 0.6 | 1.3 ± 0.6 | 1.5 ± 0.6 | 0.017 | 1.3 ± 0.6 | 1.3 ± 0.6 | 1.3 ± 0.7 | 0.886 |
Operator | 0.250 | 0.409 | ||||||
A | 787 (45.3) | 747/787 (94.9) | 40/787 (5.1) | 791 (45.3) | 747/791 (94.4) | 44/791 (5.6) | ||
B | 483 (27.8) | 467/483 (96.7) | 16/483 (3.3) | 487 (27.9) | 467/487 (95.9) | 20/487 (4.1) | ||
C | 185 (10.7) | 172/185 (93.0) | 13/185 (7.0) | 186 (10.6) | 172/186 (92.5) | 14/186 (7.5) | ||
D | 162 (9.3) | 158/162 (97.5) | 4/162 (2.5) | 163 (9.3) | 158/163 (96.9) | 5/163 (3.1) | ||
E | 92 (5.3) | 88/92 (95.7) | 4/92 (4.3) | 92 (5.3) | 88/92 (95.7) | 4/92 (4.3) | ||
F | 28 (1.6) | 27/28 (96.4) | 1/28 (3.6) | 28 (1.6) | 27/28 (96.4) | 1/28 (3.6) | ||