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Reported explanations for unidentifiable (G0) or faint (G1) marking
| G0 | G1 | Total | |
|---|---|---|---|
| Central injection | 75 | 56 | 131 |
| Anthracosis | 31 | 33 | 64 |
| Pulmonary emphysema | 11 | 28 | 39 |
| Pleural thickening | 9 | 11 | 20 |
| Time lapse (dilution) | 2 | 13 | 15 |
| Insufficient injection force | 4 | 9 | 13 |
| Intrapulmonary scar/septum | 3 | 2 | 5 |
| Overlapped markings | 4 | 0 | 4 |
| Other | 4 | 7 | 11 |
| Unknown | 4 | 9 | 13 |
