Table 2.
Included Cases with Acute CO Poisoning and Polycythemia.
| Acute CO poisoning | Polycythemia | |
|---|---|---|
| Number of cases | 68 | 13 |
| Country, n (%) | ||
| North America | 2 (2.9) | 1 (7.7) |
| Europe | 45 (66.2) | 4 (30.8) |
| Middle East | 17 (25.0) | 1 (7.7) |
| Africa | 0 (0.0) | 7 (53.8) |
| Oceania | 1 (1.5) | 0 (0.0) |
| Asia | 3 (4.4) | 0 (0.0) |
| Age, n (%) | ||
| 10-19 years | 22 (32.4) | 0 (0.0) |
| 20-29 years | 33 (48.5) | 6 (46.2) |
| 30-39 years | 8 (11.8) | 3 (23.1) |
| 40-49 years | 3 (4.4) | 1 (7.7) |
| 50-59 years | 0 (0.0) | 1 (7.7) |
| Missing | 2 (2.9) | 1 (7.7) |
| Sex, N (%) | ||
| Men | 40 (58.8) | 12 (92.3) |
| Women | 27 (39.7) | 1 (7.7) |
| Missing | 1 (1.5) | 0 (0.0) |
| Symptoms, N (%) | ||
| Syncope | 36 (52.9) | 0 (0.0) |
| Headache | 34 (50.0) | 1 (7.7) |
| Dizziness | 30 (44.1) | 1 (7.7) |
| Nausea or vomiting | 26 (38.2) | 0 (0.0) |
| Weakness or collapse | 10 (14.7) | 1 (7.7) |
| Impaired consciousness | 9 (13.2) | 3 (23.1) |
| Injuries | 5 (7.4) | 0 (0.0) |
| Shortness of breath | 4 (5.9) | 0 (0.0) |
| Vertigo | 3 (4.4) | 0 (0.0) |
| Chest pain | 3 (4.4) | 0 (0.0) |
| Seizure | 3 (4.4) | 0 (0.0) |
| PE or DVT | 0 (0.0) | 2 (15.4) |
| Facial plethora | 0 (0.0) | 2 (15.4) |
| Others | 17 (25.0) | 2 (15.4) |
| None | 2 (2.9) | 2 (15.4) |
| Missing | 0 (0.0) | 0 (0.0) |
| Onset of symptoms, N (%) | ||
| During exposure | 9 (13.2) | 0 (0.0) |
| Shortly after exposure | 16 (23.5) | 0 (0.0) |
| Delayed after exposure | 8 (11.8) | 0 (0.0) |
| No apparent symptoms | 2 (2.9) | 2 (15.4) |
| Missing | 33 (48.5) | 11 (84.6) |
| COHb levels | ||
| Number of valid cases | 65 | 6 |
| Mean (SD) | 22.2 (8.4) | 24.6 (10.9) |
| Missing, N (%) | 3 (4.4) | 7 (53.8) |
| Hb levels | ||
| Number of valid cases | 3 | 13 |
| Mean (SD) | 15.5 (1.6) | 20.5 (2.0) |
| Missing, N (%) | 65 (95.6) | 0 (0.0) |
CO: carbon monoxide; COHb: carboxyhemoglobin; DVT: deep vein thrombosis; Hb: hemoglobin; PE: pulmonary embolism; SD: standard deviation.