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Post-procedure lung ultrasound compared with a reference standard: 2×2 table
| Reference standard | Post-procedure lung ultrasound | Total | |
| Definite pneumothorax | No pneumothorax | ||
| Pneumothorax present | 4 | 15 | 19 |
| Pneumothorax absent | 1 | 121 | 122 |
| Total | 5 | 136 | 141 |
