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Distribution of diagnostic methods used to confirm the false-negative results.
| Confirmation method | False-negative rate, n (%) |
|---|---|
| Clinical manifestations of disease | 26 (40.6) |
| Surgery | 18 (28.0) |
| Secondary biopsy | 15 (23.4) |
| Bronchofibroscope | 3 (4.0) |
| Thoracoscope | 1 (2.0) |
| Cancer cell in hydrothorax | 1 (2.0) |
| Total | 64 (100) |
