Table 2. Biopsy success percentage and ratio according to the number of passes.
| No. of passes | No. of stations | Failed, n (%) | Success, n (%) | Success percentage (%) | Success ratio | P value |
|---|---|---|---|---|---|---|
| 1 | 38 | 18 (16.1) | 20 (8.4) | 52.6 | 1:1.11 | <0.001 |
| 2 | 173 | 67 (59.8) | 106 (44.4) | 61.3 | 1:1.58 | |
| 3 | 102 | 23 (20.5) | 79 (33.1) | 77.5 | 1:3.43 | |
| 4 | 33 | 4 (3.6) | 29 (12.1) | 87.9 | 1:7.25 | |
| 5 | 5 | 0 | 5 (2.1) | 100.0 | All | |
| Total | 351 | 112 | 239 | 68.1 | 1:2.13 |
Number of passes was defined as the number of needle punctures per lymph node. The success percentage was calculated by dividing the number of successful stations by the total number of stations and multiplying it by 100. Success ratio was calculated as the ratio of failed to successful stations.